Robinson Jeffers, from "Original Sin," 1946:

The man-brained and man-handed ground-ape, physically

The most repulsive of all hot-blooded animals

Up to that time of the world: they had dug a pitfall

And caught a mammoth, but how could their sticks and stones

Reach the life in that hide? They danced around the pit, shrieking

With ape excitement, flinging sharp flints in vain, and the stench of their bodies

Stained the white air of dawn; but presently one of them

Remembered the yellow dancer, wood-eating fire

That guards the cave-mouth: he ran and fetched him, and others

Gathered sticks at the wood’s edge; they made a blaze

And pushed it into the pit, and they fed it high, around the mired sides

Of their huge prey. They watched the long hairy trunk

Waver over the stifled trumpeting pain,

And they were happy...

http://www.poetryfoundation.org/poem/176425

While it's hard to fault Jeffers in this judgment, I would nonetheless insist that the chimpanzee is at least #2. Even gorillas are just plain vile. Last month I took the kids to see the gorillas at the SF Zoo, and one female took deadly aim at the audience with a pile of poo - missing, but barely. Perhaps the entire primate clade is just a mistake.