For at least a decade, California has tried to restrict the use of rat poison so it stops killing all manner of creatures besides rats. So far, it hasn’t worked. When a wild animal preys upon a rat ...

Humans have been poisoning rodents for centuries. But fast-breeding rats and mice have evolved resistance to earlier poisons.

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This mountain lion, known as P-47, was found dead in Southern California on March 21, 2019, with rat poison in his system. Rats thrive around humans, for good reason: They feed off crops and garbage ...