Spider Monkeys Make War Too


Link does not have the whole article, only the first coupla paragraphs...

http://www.newscientist.com/article/dn9231-spider-monkeys-go-on-the-warpath.html

Raiding parties, subterfuge and warfare - chimps and humans use these
tactics, but now they have been observed in a non-ape for the first time

RAIDING parties, subterfuge and warfare. Chimps use these tactics, humans
are all too skilled in them, and now they have been observed for the first
time in a non-ape - the relatively little-known spider monkey.

During a long-term study of the monkeys in Mexico, Filippo Aureli of
Liverpool John Moores University, UK, and his colleagues came upon small
groups of males travelling deep into the territory of neighbouring monkeys.
Spider monkeys (Ateles geoffroyi) usually spend all their time in the trees,
so the researchers were amazed to see these males creeping along silently
in single file on the ground, looking about them and rarely stopping to
feed.

"They were clearly aware that they were on risky territory and behaved in
exactly the way described for groups of male chimpanzees when searching for
members of neighbouring communities to attack," says Aureli. Four of seven
witnessed raids resulted in concerted aggression against ...
.