Orangutans (Pongo pygmaeus) and bonobos (Pan paniscus) point to inform a human about the location of a tool
Animal Cognition (2009) - Comment
pubmed: 18953583  doi: 10.1007/s10071-008-0194-8  issn: 1435-9456  issn: 1435-9448 

Felizitas Zimmermann, Franziska Zemke, Josep Call, Juan Carlos Gómez