Because buff is effective in camouflage, it is often naturally selected.

Many species are named for their buff markings, including the buff arches moth, the buff-bellied climbing mouse, and at least sixty birds, including the buff-fronted quail-dove, the buff-vented bulbul, and the buff-spotted flufftail.
Because buff is effective in camouflage, it is often naturally selected. 
Many species are named for their buff markings, including the buff arches moth, the buff-bellied climbing mouse, and at least sixty birds, including the buff-fronted quail-dove, the buff-vented bulbul, and the buff-spotted flufftail.
Buff (colour)