Color Vision in the Manatee (Trichechus manatus)

  title={Color Vision in the Manatee (Trichechus manatus)},
  author={Ulrike Griebel and Axel Schmid},
  journal={Vision Research},
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… CONTINUE READING


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