Why do they call women who get involved with younger men "cougars"?

Question

Why do they call women who get involved with younger men "cougars"?

Answer 1

Because in the wild the female cats are the hunters and when they hunt they go after the very young or sick(anna nicole smith haha) because the young and sick are easy prey.

Answer 2

i often wonder that myself..but i found this

Cougar  

A woman in her sexual prime who prefers to hunt rather than be hunted. A cougar's victims are usually under 25, as cougars prefer to mate with men who still have hair. Cougars generally feed and then continue hunting, as they enjoy role reversal.