Chimps and Humans
On the basis of all the evidence, the closest relative of the human proves to be the chimp. The closest relative of the chimp is the human. Not orangs, but people. Us. Chimps and humans are nearer kin than are chimps and gorillas or any other kinds of ape not of the same species.
— Carl Sagan and Ann Druyan, 1993
From the book Shadows of Forgotten Ancestors: A Search for Who We Are