Look at this: Ravens use referential gestures

Research report (imported) 2011 - Max-Planck-Institut für Ornithologie

Pika, Simone
Humboldt Forschungsgruppe Vergleichende Gestische Kommunikation
The Humboldt Research Group focuses on cognitive complexity underlying gestural signaling in three model groups to uncover the mystery of language evolution: different human cultures; closely related species; and species which live in comparable social systems. In a new study, they showed that ravens use their beaks similarly to hands to show and offer objects to conspecifics. These referential gestures may be used to test the interest of a potential partner or to strengthen an already existing relationship.

For the full text, see the German version.

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