In parts of the USA and Canada the native 'big cat' is the cougar (mountain lion, puma) which is also known as the 'panther.' However, the puma isn't actually a big cat, despite its size, it is simply the largest of the Lesser Cats as it cannot roar like the leopard, lion and tiger. In other regions of the world the 'panther' is a term to describe another, and official 'big cat,' being the darker......