Color vision in the manatee (Trichechus manatus).

摘要: Four manatees were trained to discriminate between a colored stimulus and shade of gray in two-fold simultaneous choice situation. The colors blue, green, red blue-green tested against shades varying from low high relative brightness. animals distinguished both blue green series grays but failed certain steps grays. could not UV-reflecting white target an UV-absorbing target. results indicate that possess color vision which is most likely dichromatic.