Authorities say a mountain lion that managed to cross a Southern California freeway and make its home in the mountains north of Los Angeles had rat poison in his system when he was found dead.
The lion, dubbed P-41, was found in October, shortly after a wildfire burned part of his range. Researchers at first wondered if the fire contributed to his death.
The Santa Monica Mountains National Recreation Area announced Tuesday that P-41 had six compounds of a rodenticide in his system - although it's unclear if that caused his death.
Researchers say P-41 may have eaten a squirrel or other animal that ingested the poison, or snacked on a coyote or other predator that ate tainted prey.
The National Park Service has found poison compounds in 14 local cougars, including a kitten.
Here's how rat poison works its way up the food chain: