I remember watching a very interesting display of hunting (?) behaviour in chimpanzees more than a decade ago. It was in a zoo in Florida, USA, where the chimps were kept on an artificial island with different species of rather common wild ungulates (fallow deer, Eland, Blackbucks etc.) in a larger exhibit surrounding the island. Visitors could drive through the ungulate exhibit and past the chimp island on a small train. Additionally, You could watch this area of the zoo from a wooden bridge. While sitting on the slowly moving train, I saw a fallow deer buck swim over to the island and disappear in the tall grass. The chimp group sitting in the background of the enclosure at first did not seem to care, but after a while two or three adult males slowly stood up and started to move torwards the tall grass. What happened now reminds one of old Safari hunting stories and diverse Hollywood movies: all You could see was the faint movement of the tall grass where the chimps had disappeared and were quietly moving around, after having split up. It seemed like they were trying to surround the area where the deer most likely hid. Suddenly, it all happened very fast: the chimps closed down on the deer. With a outburst of energy, the deer "catapulted" itself of the grass, with the chimps breathing very close down its neck. A vast bound-and it just succeeded in jumping into the moat, thus escaping his simian pursuers. I don't know whether the chimps had just shown territorial defense behaviour or had really been determined to hunt down and kill the buck-but the popular images and movies of chimpanzees hunting down monkeys in the wild reminded me quite a bit of the purposefulness and speed of the attack I had witnessed back there.