Black rats are developing a genetic mutation linked with a resistance to rat poisons. And there’s more bad news.

The most commonly used poisons are called anticoagulant ... When wild animals consume rat poison – typically, by eating a poisoned rat – the effects may include internal bleeding and lesions ...

Rat poison detected in around a third of wild mammal carnivores — including those that don't normally eat rodents, such as mountain lions and gray wolves. When you purchase through links on our ...

The most commonly used poisons are called anticoagulant ... When wild animals consume rat poison—typically, by eating a poisoned rat—the effects may include internal bleeding and lesions ...