As if living in the harsh Rocky Mountains wasn't enough, cougars now have to deal with a new enemy - reintroduced wolves.
With the cougars having to compete for prey and protect their cubs against marauding wolf packs, the age-old rivalry between cats and dogs has turned into a deadly battle for survival.
Donate now and help Save Big Cats!Click here to take part in National Geographic's Big Cats Initiative and raise money for field research.
Find out what's on with our monthly programme updates.
Get 2 free return flights to New York with Virgin Atlantic when you purchase and register a Jeep® Grand Cherokee before 31 March
Get up close with amazing creatures.
The official stream of Nat Geo TV.
The official UK page for Nat Geo WILD
Cookies are very small text files that are stored on your computer when you visit some websites.
Strictly necessary and performance