Subject: What collateral animal deaths result from organic and conventional farming?

I recently ran across a post on Deja.com that asserted there is a huge 
death toll in crop production.  

"the vertebrate deaths come from: frogs, toads, anole lizards, shrews, 
voles, mice, rats, snakes, a couple of kinds of turtle, cat, rabbits, 
skunk, nutria & muskrats, raccoons, possums, deer, pheasant, quail, 
pigeon, cattle egrets, sparrows, starlings, waxwings, .... although all of 
these are not harvested *every* time, or even most times, they are 
the 'regulars.' occasionally a: turkey, canvasback, teal, heron, mallard, 
black duck, coot, spoonbill, crow, hawk, kite, buzzard ... is shredded, as 
is the occasional feral pig or lost calf, coyote or dog. 

for information, an acre has 43,264+ square feet. the vast majority of the 
deaths are (as one would imagine): frogs, toads and anole lizards; rodents 
and insectivores."

Have there been any scientific studies on this kind of thing?  Is this 
common or simply nonsense?

I would appreciate any links you could point me to.

Re: What collateral animal deaths result from organic and conventional farming?