baboon

paviaani An Old World monkey of the genus Papio, having dog-like muzzles and large canine teeth, cheek pouches, a short tail, and naked callosities on the buttocks.
1971: Philip José Farmer, Down in the Black Gang: and others; a story collection, http://books.google.co.uk/books?id=qPkdAAAAMAAJ&q=%22congress+of+baboons%22&dq=%22congress+of+baboons%22&ei=ROw_SvKML6DcMIev3MAO&pgis=1 page 79 (Nelson Doubleday)

Mix swallowed the comment he wanted to make, that the council hall stank like a congress of baboons. But he was in no position to insult his host, nor should he. The man was only expressing the attitude of his time.