FILE - This April 18, 2008, file photo provided by the U.S. Fish and Wildlife shows a gray wolf. A scientific review says the U.S. government?s bid to lift federal protections for gray wolves across most of the Lower 48 states is based on unproven claims about their genetics. The U.S. Fish and Wildlife Service peer review panel released its report Friday Feb. 7, 2014. It represents a significant setback for the pending proposal to take gray wolves off the endangered species list except in the desert Southwest. (AP Photo/U.S. Fish and Wildlife Service, Gary Kramer, File)

When you bite into a hamburger or steak, you already know the cost to the cow, but what about the wolves, coyotes, bears and other wildlife that were killed in getting that meat to your plate?

There are a lot of ways that meat production hurts wildlife, from habitat taken over by feed crops to rivers polluted by manure to climate change caused by methane emissions. But perhaps the most shocking is the number of wild animals, including endangered species and other non-target animals, killed by a secretive government agency for the livestock industry.

Last year Wildlife Services, an agency within the Department of Agriculture, killed more than 2 million native animals. While wolf-rancher conflicts are well known, the death toll provided by the agency also included 75,326 coyotes, 3,700 foxes and 419 black bears. Even prairie dogs aren't safe: They're considered pests, blamed for competing with livestock for feed and creating burrow systems that present hazards for grazing cattle. The agency killed 12,186 black-tailed prairie dogs and destroyed more than 30,000 of their dens.

The methods used to kill these animals are equally shocking: death by exploding poison caps, suffering in inhumane traps and gunned down by men in airplanes and helicopters.

How many of the 2 million native animals were killed to feed America's meat habit? No one really knows. This is where the secrecy comes in: While we know that they frequently respond to requests from the agricultural community to deal with "nuisance animals," Wildlife Services operates with few rules and little public oversight. That's why the Center for Biological Diversity, where I work, has called on the Obama administration to reform this rogue agency to make it more transparent and more accountable. Despite the growing outcry from the public, scientists, non-governmental organizations and members of Congress, the federal agency shows no signs of slowing its killing streak.

There are two important ways that you can help rein in Wildlife Services. First, sign our online petition demanding that the Department of Agriculture create rules and public access to all of the agency's activities. Second, start taking extinction off your plate. Our growing population will mean a growing demand for meat and for the agency's deadly services, unless we take steps to reduce meat consumption across the country. By eating less or no meat, you can reduce your environmental footprint and help save wildlife.