Prof. Matsuzawa (right)with Gen Yamakoshi (left) and Tatyana Humle (center). At the time, Tatyana was an undergraduate student at the University of Edinburgh. It was Tatyana's first field research on wild chimpanzees. Before 1995, we always conducted our survey of the Bossou chimpanzees in winter. In 1995, we conducted our first survey in summer. We made several new findings. For example, another tool using behavior, later defined as algae scooping, was observed for the very first time.
Chimpanzees using sticks to scoop floating algae from the pond surface. After scooping, the stick is brought up to the mouth and the algae eaten.
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