This is a photograph of a male orangutan attempting to spear a fish.
It is believed that this male has seen fish spearing by local fish spearing men. This is on Kaja Island, in Borneo. Quite a few of the apes in this area are “rehabilitated” having been earlier rescued from human possession. It is often among these rehabilitated apes that we see remarkable behavior of this kind.
This method never worked out for this guy, but reports are that he later figured out how to use spearing to poach fish already caught on lines. This photo is actually published in the book Thinkers of the Jungle. The news report is here. Hat tip: Jenny Zick