title: Color vision in the manatee (Trichechus manatus).
abstract: Four manatees were trained to discriminate between a colored stimulus and a shade of gray in a two-fold simultaneous choice situation. The colors blue, green, red and blue-green were tested against shades of gray varying from low to high relative brightness. The animals distinguished both blue and green from a series of grays but failed to discriminate red and blue-green from certain steps of grays. The manatees could not discriminate between a UV-reflecting white target and an UV-absorbing white target. The results indicate that manatees possess color vision which is most likely dichromatic.
authors.affiliation: Department of Zoology, University of Vienna, Austria.
authors.forename: U
authors.initials: U
authors.lastname: Griebel
authors.forename: A
authors.initials: A
authors.lastname: Schmid
mesh_terms: D000818:Animals; D003118:Color Perception / Q000502:physiology*; D004192:Discrimination, Psychological; D005260:Female; D008322:Mammals / Q000502:physiology*; D013053:Spectrophotometry