"Alien Big Cat" is the official term for a non-native, large cat, and refers to pumas and also to panthers, leopards, lynx, and any other big furry cat-like critter that is living wild.

BBC: The Surrey puma: Fact or fiction?

Cat Haven breeds and keeps lions, tigers, jaguars, lynx and other exotic cats and takes them out for public appearances.

NPR: Lion Killed Woman As She Was Cleaning Enclosure

The researchers believe that the lynx had been in captivity for some time, but they were unable to find any records of the cat's owner.

BBC: 'Big cat' Canadian lynx was on the loose in UK in 1903