Grey-legged night monkey  (Aotus griseimembra)

The grey-legged night monkey is known for certain only in northern Colombia (4), roughly between the Rio Sinu and Rio Cauca (2).

Preferring older, undisturbed forests with high species diversity, the grey-legged night monkey is found only in primary forest and very old secondary forest, but never in young secondary forest (4). Their nest sites are inconspicuous to reduce the threat of predation. They are commonly found in holes in hollow trees, sometimes in cohabitation with bats, as well as in dense vine tangles (3).