Pigeons Bred with Camouflage, 1941
Camouflaged pigeons, with a mottled plumage to make them almost invisible to the enemy, were bred in Ontario, during WWII, by Ray R. Delhauer, a retired officer.
Believing that pigeons were too vulnerable because bright patches of white or colored feathers made them an easy target, Delhauer bred and crossbred his birds until he achieved a strain with mottled gray and dusty white feathers on their under-bodies as well as on their wings and backs.
(Popular Science, Jan, 194, p. 81)