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Most birds appear to have well-developed color vision. Apes and monkeys also have the ability to tell colors apart. Most mammals, however, are color-blind. Dogs and cats seem to be color-blind and only see shades of black, white, and gray. Sources: Cruickshank, Allan D. 1001 Questions Answered About Birds, p. 129; World Book Encyclopedia, vol. 13, p. 120.
