These chimpanzees select branches, remove leaves and side twigs, and sometimes even sharpen the tips with their teeth to create spear-like sticks. These sharpened sticks are then used by the ...

A shriek broke the dawn on the savannah, followed by more screeches and the rustle of branches: The wild Fongoli chimps were bidding each other good morning in the dry, scraggly Sahel. The rare ...

Humans often use weapons when hunting or defending themselves. However, we are not the only animals that create our own hunting tools. Chimpanzees in southeast Senegal have exhibited this behavior. In ...