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Journal of Experimental Biology, Vol 200, Issue 11 1587-1592, Copyright © 1997 by Company of Biologists

JOURNAL ARTICLES

Brightness discrimination ability in the West Indian manatee (Trichechus manatus)

U Griebel and A Schmid
Department of Zoology, University of Vienna, Austria.

Two manatees were tested on their ability to discriminate brightness using a series of 30 shades of grey varying from white to black. The animals were trained to discriminate between different shades of grey in a twofold simultaneous-choice situation. Their ability to discern brightness differences correlates with Werber's law, and the calculated Werber fraction is 0.35.




© The Company of Biologists Ltd 1997