system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do lions live in prides if cats in general are solitary animals?

EDIT: Wow, was not expecting so many responses!

This is probably a separate question altogether, but every pride I've seen in a nature documentary has one male and a bunch of females. Does that mean that there a whole lot of single males roaming the savannah? Or do these males necessary get killed off by other dominant males? Seems like that would create a bit of a gene pool situation, no?
gpt
They are different species which have evolved different patterns of behavior. Those behaviors persist because they are successful. A pride of lions, for instance, can bring down prey that would be difficult or impossible for a single lion to bring down. 

Your house cat is not descended from a lion, or vice versa, though they share a common ancestor. 

I will note, however, that cats do congregate into groupings at times, so called feral cat colonies, depending upon the availability of food.