A community of chimpanzees living on the edges of the savanna in Senegal has learned to fashion and use spears, which they sharpen with their teeth. These are chimps we've been observing for two hundred years; they never used spears. Now they've begun spiking little bush babies with them. The bush babies hide in hollow trees. The chimps do a sort of frog-gigging number on them and pull them out like fondue.
Source: wiktionary