File:Gorrila tool use-Efi.jpg

See also: Image:Gorilla tool use-Leah.jpg

Summary

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Female Efi Using Trunk as a Stabilizer during Food Processing at Mbeli Bai

The top photo shows the intact trunk shortly before Efi manipulated it (visible to the left of female Fulani). The trunk was then detached by female Efi with both hands (middle), pushed into the ground, and used as a stabilizing stick while dredging aquatic herbs towards her with her other hand (bottom).

From: Breuer T, Ndoundou-Hockemba M, Fishlock V (2005) First Observation of Tool Use in Wild Gorillas. PLoS Biol 3(11): e380. doi:10.1371/journal.pbio.0030380

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