Peter_Arbeitslos , vor 10 Tagen Zufallsfakt: https://theconversation.com/chimps-like-to-copy-human-visitors-to-the-zoo-ig-nobel-prize-104978
Zufallsfakt: https://theconversation.com/chimps-like-to-copy-human-visitors-to-the-zoo-ig-nobel-prize-104978