Why is evolution hiding?

[tor]

Of the 57 species of Hominidae (great apes) known to have existed only 4 are still living. When we say 'Survival of the Fittest' it isn't a meaningless term. As to the precise details of the agent of extinction, members of the family Felidae would be prime suspects, the less fit would almost invariably becomes something else's lunch.

So why did these more advanced apes go extinct but Gorillas and Chimps did not?

Actually I think these 2 are on the way there