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I haven't been to Nicaragua.

Other People's trip reports
Nicaragua 2010: Vladimir Dinets, 10 days & a variety of bats and rodents.

Nicaragua 2007: Michal Polanski, 3 weeks & 10 species including Tayra, both Sloths and a Kinkajou.

Central America (Costa Rica, Nicaragua and Guatemala): Curtis Hart - a few notes on different national parks.