I'm black as the night, but I hide it well
I'm the fastest around, as my fleeing victims can tell
My brothers and sisters live everywhere on earth
Except on the Poles, there we give no birth
I live on one continent only, with an A it starts
It lies in the south, on almost all geographic cards
Our species survived the massive extinction, a long time ago
My ancestors and dinosaurs could have been friends, for all I know
So, what animal am I?
See my comment on @Thrax' answer. (S)he had two of the lines correct.