Government bureaucrats delay life-saving road projects, but let wind turbines butcher bats

English: Indiana Bat (Myotis sodalis) being he...

Indiana Bat (Myotis sodalis) being held in a hand. (Photo credit: Wikipedia)

Cut fingers, cancer, bats and birds

Guest post by Paul Driessen and James H. Rust

Georgia residents recently learned that a rare bat has stalled state highway improvements. The May 2012 sighting of an endangered Indiana brown bat in a northern Georgia tree has triggered federal regulations requiring that state road projects not “harm, kill or harass” bats.

Even the possibility of disturbing bats or their habitats would violate the act, the feds say. Therefore, $460 million in Georgia road projects have been delayed for up to eighteen months, so that “appropriate studies” can be conducted. The studies will cost $80,000 to $120,000 per project, bringing the total for all 104 road project analyses to $8-12 million, with delays adding millions more.

Bats are vital to our ecology, agriculture and health. A single colony of 150 big brown bats can consume up to 1.3 million flying insect pests per year, Dr. Justin Boyles and other scientists point out, preventing crop damage and eradicating countless mosquitoes. If Indiana bats are expanding their range from Tennessee into Georgia, that could be good news.

“White nose syndrome” is impacting populations of hibernating bats in caves all over the Eastern USA. The infectious disease is probably fungal in origin, these scientists say, and the loss of North America’s bats to WNS could cost farmers $4-53 billion per year – and let mosquitoes proliferate.

At first blush, then, the delay-and-study decision by the US and Georgia Departments of Transportation (DOT) and US Fish and Wildlife Service to protect these voracious furry flyers makes sense. (The FWS enforces the Endangered Species Act, Migratory Bird Treaty Act and similar laws.)

However, the Georgia bat study action is akin to obsessing about a cut finger, while ignoring cancer. The schizophrenic decision underscores how environmental concerns, DOT actions and federal threats to impose penalties or withhold highway funds too often seem to reflect ideologies, agendas and politics, rather than science or actual risks of harming a species.

It’s true that Peach State highway projects could conceivably affect bat colonies or daytime rest periods for these nocturnal creatures, to some small degree. But the road work will reduce accidents and crash-related deaths – and delays will likely result in more injuries and fatalities.

Meanwhile, other human activities are decimating bat populations all over America. But environmental groups remain silent, and state and federal wildlife “guardians” do little to stop the carnage. How is that possible?

The exempted activities involve heavily subsidized wind turbines that generate expensive, intermittent electricity and require “backup” hydrocarbon-fueled power plants for some 80% of their rated or “nameplate” capacity.

A US Geological Survey report investigated the causes and consequences of bat fatalities around the world. Other analyses have addressed the violent effects that wind turbines have on bats, which are vulnerable because turbines are especially busy at night, when bats are everywhere but electricity demand is at its lowest. Bats are struck by blades traveling 100-200 mph at their tips or felled by “barotrauma,” sudden air pressure changes that explode their lungs, as explained in a 2008 Scientific American article “On a wing and low air: The surprising way wind turbines kill bats.”

Supposedly “eco-friendly” wind turbines in the Mid-Atlantic Highlands kill tens of thousands of bats annually. The Fowler Ridge and Meadow Lake facilities in northwestern Indiana already have 475 gigantic turbines on 75,000 acres; an additional 150 wind turbines are planned; and all are in the middle of prime Indiana bat habitat.

Even worse, long after the slaughter began, the USFWS is evaluating whether to grant Fowler Ridge a 22-year “incidental take” permit, so that the turbines can continue decimating bats – and the operators can continue being exempted from laws and penalties that apply to everyone else.

Of course, bats aren’t the only victims. Numerous rare, vital and endangered bird species are also at risk from wind turbines – including whooping cranes, hawks, falcons, and bald and golden eagles.

To minimize public outrage over the eco-slaughter, Fish and Wildlife has changed its census methods for “whoopers” (to make it harder to calculate how many cranes have “gone missing” along their turbine-dotted Alberta-to-Texas migratory corridor); allows wind facility operators to use search methods that ensure that most dead and injured birds (and bats) will never be found; initiated a process to issue 30-year “incidental take” permits for killing bald and golden eagles; and refused to prosecute wind facility operators for annihilating birds and bats.

The proposed New Era Wind Farm in Minnesota will likely kill 8-14 bald eagles annually. It is yet another example of serious environmental impacts overlooked in the quest to “go green” and meet state “renewable” energy mandates – as though this wildlife destruction is “sustainable” or “acceptable.”

Projects like New Era or Shepherds Flat in Oregon also mean a person could be fined or jailed for possessing a feather from a bald eagle decapitated by a wind turbine – but the turbine operator would get off scot free.

A 2012 Spanish Ornithological Society study and 1993 studies in Germany and Sweden found that a typical wind turbine kills 333-1,000 birds and bats annually in Spain, up to 309 birds per year in Germany, and as many as 895 birds and bats in Sweden. World Council for Nature chairman Mark Duchamp estimates that turbines kill twice as many bats as birds.

That means the more than 40,000 turbines operating in the United States, often in or near important habitats, could easily be killing 13 million to 39 million birds and bats every year!

And yet, most environmentalist groups say nothing, and the Fish and Wildlife Service does nothing.

However, Georgia taxpayers must pay millions for bat studies – enriching researchers and reducing taxpayer wealth – to ensure that road projects do not disturb the flying mammals. Meanwhile, the state’s drivers and passengers must wait years for safety and other improvements to their highways.

Ironically, Indiana bats that are to be studied and protected in Georgia could get chopped in half en route by “Cuisinarts of the air” that Uncle Sam considers so holy the turbines must be safeguarded against endangered species laws, regardless of environmental costs.

Too many other health, environmental and economic impacts are routinely ignored by developers and regulators alike, where wind turbines (and biofuels) are concerned. That cannot continue.

As summer approaches, Americans should also consider what life will be like when windmills cause bat populations to crater. Freed of their natural predators, mosquitoes will thrive, and they have a much more unquenchable thirst for human blood than do bats of folklore and Dracula tales.

It’s high time that people’s safety – and truly devastating impacts on important bird and bat species – stopped taking a back seat to political agendas, crony corporatism and folklore environmentalism. It’s no longer acceptable to paraphrase Joseph Stalin’s obscene axiom, and say: A single bird or bat death is a tragedy. A million deaths is a statistic.

______________

Paul Driessen is senior policy advisor for the Committee For A Constructive Tomorrow (www.CFACT.org) and author of Eco-Imperialism: Green power – Black death. James Rust is a policy advisor for The Heartland Institute (www.Heartland.org), retired professor of nuclear engineering, and outspoken critic of unnecessary alarmism over “dangerous manmade global warming.”

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GlynnMhor

(sigh) It’s almost too depressing to read.

As is probably well known to WUWT regulars I’m a bird watcher and bird feeder. What I think of this cannot be printed even in Playboy. The stupidity of wind enviormentally is a crime against Nature.

Andrew Harding

Political correctness transcends common sense and life itself. This is why I despise it and those who practise and justify it. It is a shallow creed for shallow, non thinkers.

rogerknights

Batty.

How typical of the way “green” harms the environment, and of the hypocrisy of its greedy, tyrannical mindset.

trafamadore

“That means the more than 40,000 turbines operating in the United States, often in or near important habitats, could easily be killing 13 million to 39 million birds and bats every year!”
For perspective, cats in the US kill a hundred times more:
http://articles.washingtonpost.com/2013-01-31/national/36650863_1_outdoor-cats-feral-cat-george-h-fenwick
“Projects like New Era or Shepherds Flat in Oregon also mean a person could be fined or jailed for possessing a feather from a bald eagle decapitated by a wind turbine”
Oh arent you the misleading ones…you mean only “fined or jailed for possessing a feather from a bald eagle”.
The wind turbine has nothing to do with the law.
And there is a apples and oranges problem when you keep mixing Endangered Species protections with bird/bat kills; they are not really comparable.

Theo Goodwin

Where are those Greens who champion wildlife? Why have we not heard from them?

Brian Johnson UK

It is disgusting the way these “Greenies” will stop food production for the sake of a newt that hasn’t been seen for years or stop construction of badly needed roads and then kill without any conscience or remorse hundreds of flying creatures of all shapes and sizes for the sake of a gas that is not going to harm anyone other than steal all our hard earned money.

Thank you for raising awareness of bat fatalities from wind turbines.

blueice2hotsea

I am wondering how the snail darter could halt a reservoir project, but the bald eagles, endangered bat species and up to 39,000,000 individual sentient creatures count for nothing? My cynical explanation is that psychopathic hypocrites care naught for sentient creatures except to the extent genuine concern can be exploited. Hope I am wrong.

Jason

This is the ultimate face-palm.

RoyMc

In the UK for a while to get permission for any new road it had to be built with bat gantries at £300,000 a pop. There were supposed to ensure that bats could safely fly over the road. After several were built, someone got around to investigating whether bats actually used them. No prizes for guessing the answer… http://www.plosone.org/article/info:doi/10.1371/journal.pone.0038775

Anyone know why JoNova’s site is down/unreachable?
From both here:
http://networktools.nl/ping/joannenova.com.au

— joannenova.com.au ping statistics —
3 packets transmitted, 0 received, 100% packet loss, time 2007ms

and from Texas:

Pinging joannenova.com.au [223.27.18.253] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 223.27.18.253:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

Latitude

Wait a minute here, Indiana bats are expanding their range from Tennessee into Georgia….
Someone didn’t get the memo……global warming says they should be moving north….sooner and faster

Peter Miller

I guess this all makes perfect sense if you are a climate scientist or natural climate change denier.

Rud Istvan

The saddest part is that wind will never be economic without subsidies that supposed to be temporary when they started in 1992, but despite the sequester will cost 12 billion in 2013 according to CBO. The reason is simple. In addition to the direct cost of wind, there is the additional cost of the intermittent capacity that must be available when the wind doesn’t blow. This is usually gas turbine peakers. Using only ‘official’ EIA numbers for levelized generation in 2017, it is trivial to show that the true cost of wind is much greater than nuclear ( which doen’t produce CO2 and doesn’t kill birds and bats). The only thing more hopeless is solar PV, since the hidden cost of intermittency is similar while the direct cost is much greater. The (grid scale) solar industry is imploding even in California, taking more wasted billions in subsidies with it.

Auto

40,000,000 million bats and birds is a big number, far higher than I would wish to see die at the hands/arms of (sometimes) wind-power-producing towers – but the USA is also pretty large, in fairness.
The ‘baro-trauma’ is unfamiliar to me [perhaps it shouldn’t be!].
The policy decision – to prioritise intermittently-effective windmills [and incidental fauna tramatisers] – is all of a piece with muzzling the press, imposing unaccountable quangoes, increasing ‘green’ (i.e. wealth transferring, from wealth creators to wealth destroyers] taxes, promoting crony-access to funds, decisions, sweet-heart deals and the rest.
The politicans, of course, are utterly selfless.
[Do I need to add /sarc/ ?]

JPS

Let me start by saying that I think wind energy is a joke and complete waste of time and money. That said, these numbers just dont make any sense. If a single wind turbine kills 300-1000 birds a years, and twice as many bats, the area below the wind turbine would be littered with bird and bat carcasses (carcai?). i cannot say that I have ever been at the bottom of a wind turbine and perhaps someone can lead me to pictures of this carnage, but for what it is worth color me skeptical.

trafamadore [April 7, 2013 at 10:28 am] says:
“That means the more than 40,000 turbines operating in the United States, often in or near important habitats, could easily be killing 13 million to 39 million birds and bats every year!”
“For perspective, cats in the US kill a hundred times more:”

You warmies are certifiable. You’re like children.
(1) Cats, like all animals are part of nature, unlike concrete and steel bird blenders. Supposedly this is an important part of the naturalist and environmentalist mindset.
(2) Cats, like all natural predators go for the low hanging fruit in pure Darwinian fashion. They take the easy, the weak, the sick, the wounded, and least capable of surviving which in turns strengthens the species. The bird blenders pick off the soaring animals who by definition are fit. Not only that, they nail them during migration and even reproduction. Windmills are anti-Darwinian in every sense.
(3) Those numbers ya’ll keep citing are completely ridiculous. Anyone who has cats, or lives near wild animals or even has windows on their house ( another eco-nut strawman ) knows that these figures are just made up.
You guys are pure propagandists. The only question I have is whether you really believe this nonsense or will simply just say anything to thwart scrutiny of your sick religion. If you ever stop comparing apples and oranges, you will have nothing left to talk about.

Kon Dealer

IT’S ONE RULE FOR US AND ANOTHER FOR THEM….
As usual.

Sounds to me like it’s just an excuse to conduct those expensive “appropriate studies” making it just another way of handing out green cash while real people can go to hell.

disko troop

Blade says:
April 7, 2013 at 12:10 pm
Blade,you took the words right out of my mouth and rearranged them in a much more succinct way without the swear words I was going to use.
The loony greens who constantly chime up with the cats kill bats and bats fly into buildings make my blood boil. It is like saying that because 500 children a year are run over by cars, throwing another hundred off buildings won’t matter. Up to the present day, for all its faults, humanity has largely kept to the Cities and built roads between them and in general avoided massive disturbance to the wild areas. Now thanks to these loony green, cerebrally challenged, unsustainable numbskulls who presume to know what is best for the planet we are marching the industrial windflails across the very wild areas that up until now were left for the Eagles, the raptors, the geese, and the bats. Shame on these vile people for using their creed to destroy what is left of our wild creatures in the name of their discredited religion.
Ivor Ward

Steve from Rockwood

are these real or modelled deaths?

Gail Combs

Thank you
Anyone who thinks CAGW is about ‘saving the environment’ instead of de-development and wealth re-distribution should read this essay. The fact the WWF, Greenpeace and the UN is not screaming bloody murder tells you this is not about the environment but about Obama’s Science Czar John Holdren’s famous quote.

A massive campaign must be launched to restore a high-quality environment in North America and to de-develop the United States
Resources must be diverted from frivolous and wasteful uses in overdeveloped countries to filling the genuine needs of underdeveloped countries,” Holdren and his co-authors wrote. “This effort must be largely political, especially with regard to our overexploitation of world resources, but the campaign should be strongly supplemented by legal and boycott action against polluters and others whose activities damage the environment. The need for de-development presents our economists with a major challenge. They must design a stable, low-consumption economy in which there is a much more equitable distribution of wealth than in the present one. Redistribution of wealth both within and among nations is absolutely essential, if a decent life is to be provided for every human being.”

Agenda 21 is the plan economists came up with. Of course the redistribution of wealth is from the poor and middle class to our Masters.

DaveG

This is too much, how hypocritical and arrogant these two faced greens are. Let’s face it they don’t give a S**T about the bats or the bird’s. Meanwhile I haven’t met a CAGW skeptic who doesn’t care about the environment and nature, it’s one of the main reasons we strive so hard to expose these frauds.

Makes me want to scream,so I think I will.
GIVE ME STRENGTH.
When my cat kills a Mockingbird it is in self defense.
Have you ever watched two Mockingbirds torture cat,
they will not leave a cat alone. they will pick a poor thing to death.
But every once in a while….
Besides, cat gets 2-3 birds a year,and they were ready to go anyway
Alfred

rogerknights

trafamadore says:
April 7, 2013 at 10:28 am
“That means the more than 40,000 turbines operating in the United States, often in or near important habitats, could easily be killing 13 million to 39 million birds and bats every year!”
For perspective, cats in the US kill a hundred times more:

They kill one-hundredth as many bats. (The main topic of this thread.)

u.k.(us)

Make no mistake, I think windmills are nothing more than monuments to greed and environmentalism run amok.
But to quote Willis, “show me the bodies”.
I’ve not seen anything that would begin to reflect the death rates being thrown around.
(by “seen” I mean photographic evidence).

Lately, I’ve been hearing the meme, from greens like trafamadore, that ‘cats kill more birds than wind turbines’. I don’t think they’re killing many bald or golden eagles. In fact, I think it might be the other way around.

@ Jim: OT Jo Nova’s site: first check Twitter. I don’t twit if I can avoid it but it is useful for some things 🙂
https://twitter.com/JoanneNova
“Back Soon! There is short routine maintenance on the server host. It will be short & was expected. Sorry to readers, I should have warned u.”

Bird Mincers!

DaveG says: “Meanwhile I haven’t met a CAGW skeptic who doesn’t care about the environment and nature, it’s one of the main reasons we strive so hard to expose these frauds.
Thanks Dave … because I was thinking of resigning from a local campaign to save our nature reserve from being built on … because in the long run it is more important for humanity that we stop these idiotic windmills than that I save our local nature reserve … perhaps I should rethink that.

ChootemLiz

There is serious money in “sighting” a rare species. Lots of trough money for the placement of an animal in the right location. Rent a bat must be doing well.

trafamadore [April 7, 2013 at 10:28 am] says:
“That means the more than 40,000 turbines operating in the United States, often in or near important habitats, could easily be killing 13 million to 39 million birds and bats every year!”
“For perspective, cats in the US kill a hundred times more:”
——————————–
That comment is pure garbage. Typical of the twisted logic enviro-whackos use to justify their illogical beliefs. Let’s go over it one more time. Try to concentrate and understand: cats don’t annihilate bald and golden eagles, raptors, bats, and other rare birds, as they soar, with turbine blades traveling 100-200 mph. Furthermore, do you then believe that since cats kill birds that it then justifies bird deaths caused by wind farms, and do you also believe then that we should wipe out cats since they kill so many birds?

Margaret Smith

The Mail on Sunday in UK has, for the 4th consecutive week, had an expose of things ‘green’
This week it is the damage to birds by windmills. It is by Nick McDermot (Science Reporter).
http://www.mailonsunday.co.uk/news/article-2305197/RSPB-makes-killing–windfarm-giants-turbines-accused-destroying-rare-birds.html

tobyglyn

and when the mosquito and other flying insect populations soar, they will used as proof of climate change 🙂

tz

Bats are endangered – the Emerald Ash Borer is decimating the supply of raw material for Louisville sluggers, but hockey sticks aren’t affected.

Pretty depressing, especially when it is hard to convince even those who love birds, because they are so convinced wind turbines will save the planet.
Thanks for writing this post. Every little bit helps.
I linked to it at http://sunriseswansong.wordpress.com/2013/04/07/more-about-wind-turbines-killing-birds-and-bats/

trafamadore

You people are so funny. On one hand you are complaining about highways and damn projects being put on hold because of endangered species and then you pine over bats and birds being taken out because of windmills…..And then you complain about environmentalists being as hypocritical as you.
You look in the mirror, see everything is opposite, and miss the irony completely.
As I said, pretty funny.

u.k.(us)

trafamadore says:
April 7, 2013 at 4:12 pm
You people are so funny. On one hand you are complaining about highways and damn projects being put on hold because of endangered species and then you pine over bats and birds being taken out because of windmills…..And then you complain about environmentalists being as hypocritical as you.
You look in the mirror, see everything is opposite, and miss the irony completely.
As I said, pretty funny.
===============
You spread quite the wide net, with your dispersions.
Care to highlight one ?

Mike McMillan

Oh great, I want to put in a serious comment, and I’m up after Tralfamadore. Wasn’t that the real, original name of George Jetson’s dog Astro? Move along, come back later.
REPLY: No, that was Tralfaz – Anthony

Martin Clark says April 7, 2013 at 2:18 pm
@ Jim: OT Jo Nova’s site: first check Twitter. I don’t twit if I can avoid it but it is useful for some things 🙂
https://twitter.com/JoanneNova
“Back Soon! There is short routine maintenance on the server host. It will be short & was expected. Sorry to readers, I should have warned u.”

Thanks Martin – I’ll book mark that for future use!
.

Claude Harvey

I was once required to construct several “deer ramps” over a 1,000-foot-long, 3-foot-high geothermal pipeline. I called them “handicapped deer ramps” because any “regular deer” could surely either spring over or walk around such a minor obstacle. Then there was the “four-fish-condominium”, the purported loss of which I was required to mitigate. No one even pretended that four Atlantic salmon had actually lived there; only that “they could have if they’d wanted to”. Then there was the “endangered grass” episode….
It would seem that currently fashionable wind and solar projects get a pass on environmental requirements that plague less “green desirable” efforts such as geothermal, hydro and, it would appear, roads.

TomE

James Dellingpole who seems to have stirred up quite a bit in the prior article was also the author on the article about windmills killing birds and the RSPB ignoring it in England. Sadly the same thing can be said for the Audubon Society, the EPA, Sierra Club, and the other organizations who claim environmental purity. When I was growing up a long time ago we trusted the government (Eisenhower was president) but now that we have more sources of information and our experience has broadened we trust nothing the government says or does. Situations like the changing of the rules so that windmills can kill bats and birds just prove our lack of faith. Sad state for the country.

Chuck Nolan

Why are the bats moving south to GA?
I guess sonar doesn’t pick up CAGW.
cn

trafamadore

u.k.(us) says: “Make no mistake, I think windmills are nothing more than monuments to greed and environmentalism run amok. But to quote Willis, show me the bodies.”
This comment is not directed to only ukus.
Don’t take my previous comments to mean that wind farms aren’t a bird and bat problem, I only meant to suggest they aren’t contributing to local extinctions at a level compared to habitat destruction and, for some species, hunting, and, in general, are minor compared to cat kills, something most people ignore…
However, I have sat thru more than a few talks by environmental biologists complaining about the lost of birds due to turbines and simple google searches will get you (ukus) the numbers. But learning more can at least help to control the problem. Do we move turbines off the ridge tops so we get fewer raptor ‘whack’s? Do we shutdown the mills at night when the songbirds are migrating? ( I never knew so many species migrate at night…who knows this stuff!)
The answers to these issues are complex and probably involve trade offs; reducing them to “you do this but then you do this” is for the feeble brained.

KevinK

“Don’t take my previous comments to mean that wind farms aren’t a bird and bat problem, I only meant to suggest they aren’t contributing to local extinctions at a level compared to habitat destruction and, for some species, hunting, and, in general, are MINOR compared to cat kills, something most people ignore…”
Come on, have you any REAL numbers on Bald or Golden Eagles or Cranes or Vultures or Owls or Herons killed by cats ??????????. Or is a broad statement like “are minor….” OK ?
How about the number of bats killed by cats ????? I have several very agile cats, I have a very hard time imagining them leaping 10-20 feet into the air to capture a Bat in flight.
Most of the birds killed by cats are seed eating birds on the ground, funny thing, most seeds seem to like to drop to the ground (a convenient place to germinate, perhaps ?). And most of these bird species migrate from the Northern Hemisphere to the Southern Hemisphere yearly. Many Cats (Serval, Jagurandi, etc.) exist naturally in the Southern Hemisphere and have been feeding on birds for eon’s. The birds have adapted.
Funny that bats have not adapted to turbine blades.
Your reasoning is a lot like; Well, sure I started that building on fire for no good purpose, but, DID YOU SEE THAT OTHER BUILDING ON FIRE, IT SURE LOOKS BIGGER…………..
Cheers, Kevin.

John Mason

I live up here in NW Indiana and enjoy bike riding amongst the bird choppers. Our bike club’s jersey even features a elegant drawing against a pale blue sky of these evil devices. (I chose not to buy one of these jerseys – hate to ride with propaganda on)
I really feel for these poor farmers though. They get a lot of money leasing the land for these giant Cuisinarts yet when the companies that run them go bust when the Federal subsidies stop, these same farmers will be stuck with ultimate removal of these evil contraptions at about 5 million apiece (the number I read of the Massachusetts town that’s decided to remove their Cuisinart’s due to low frequency human health issues).
If the biofuel and wind energy sectors don’t get an order of magnitude cheaper as they are scaled up, then they should not be subsidized. It ends up being a scam. And we had the experience of Spain to look at yet redid the scam anyway.
I’ve always thought that if this country was truly serious about displacing the fossil fuel industry for whatever reason, then rather than spend all this money on very diffuse and environmentally disastrous projects like solar panel farms and wind farms, spend the money instead on making fusion feasible. This could follow research along the cavitation bubble collapsing method of fusion as well as the more conventional and better researched laser implosion methods. At least these dollars might bring some windfall (pun intended) discoveries that could lead to our nation’s energy independence while avoiding the political issues of fission based energy production.
If we are to go this low Co2 route some type of nuclear is really the only choice to maintain or expand the standard of living.
Yet, why should I expect logic from these folks that really want to see the disease of man removed from infecting mother earth.

TomE

KevinK says: Funny that bats have not adapted to turbine blades.
Adapting is a learned experience. The impact of a wind turbine blade is not something that a parent bat can pass on to the young and I suspect their “auditory radar” is not effective against a large rotating blade in which almost all of the area of the danger plane is empty.

tty

For the people who insist on “seeing the bodies”. I suggest the following experiment:
Take a dead mouse. Put it somewhere quite visible in an open field.
Repeat every day for a couple of months.
Then measure how long it takes before a crow/fox “disappears” the next mouse.
Scavengers aren’t stupid. They will quickly learn where carrion can be found. I have a pair of ravens near my home patrol who patrol the local highway at the crack of dawn every day.