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I've not been to the Gambia yet.

Other People's Trip Reports
The Gambia, 2012: Mike Richardson, 1 week & 15 species including Maxwell's Duiker and Western Red Colobus.

The Gambia and Senegal, 2006: Mark Hows, 2 weeks & 16 species.

Gambia and Senegal 2006: Jeroen Verhoeff, 25 days and some nice mammals.