Orangutans Learn To Use Stone Hammers and Saws.
Orangutans in captivity use a variety of tools with very little intervention from humans. In one experiment, orangutans used stone flints to cut open a food container and to open a puzzle box. Captive orangutans have also been observed for years using handsaws and axes. This behavior is very different from the orangutans in the wild. However, wild apes do use tools to perform simple tasks. For example, orangutans have been observed using sticks to scrape the seeds out of fruit, while others use leaves to make themselves sound more formidable.