The Black-Footed Ferret's diet is mostly prairie dogs but they'll also eat some types of rodents. This type of ferret lives in grass praries within central parts of the U.S. and mid-southern areas of Canada. 300 - 400 ferrets are left in the wild.
The cause of the decline in black-footed ferret isn't just a single cause. Although, the root of the problem stems from habitat loss and disease. The disease treated within the job you just completed was a case of the Slyvatic plague. The disease is caused by fleas and can also be transmited after a black-footed ferret eats a prarie dog with the plague.
Along with many other animals black-footed ferrets face extinction. This particular mammal was chosen because it actually was said to have gone extienct... twice! With efforts towards conservation the animal is slowly making a come back. Animal conservation is important and can make a difference. Oh also one more thing before you go: