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Complexity Digest 2004.48 - 13.02
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29-Nov-2004

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Color At Night: Geckos Can Distinguish Hues By Dim Moonlight, Science News
 









Excerpts:     Twilight Zone. In dim light, the helmet gecko can tell blue from
gray, even when people can't. Inset: Pupil nearly closed in bright light (left)
and wide open in dim light (right). Roth    

Of all the vertebrates, a gecko has just become the first to ace behavioral
tests for seeing color in very low illumination.

 People, for example, go color-blind in light equivalent to dim moonlight, but
helmet geckos, Tarentola chazaliae, don't. They can still tell a blue from a
gray of the same intensity (...).

In low light, Roth couldn't distinguish the cards, but the geckos snapped at
crickets associated with blue cards more than twice as often as at those tagged
with gray ones.
Source: Color At Night: Geckos Can Distinguish Hues By Dim Moonlight[
http://www.sciencenews.org/articles/20041127/fob8.asp ], Susan Milius, Science
News, 04/11/27
AUDIO - Audible Format[ http://www.audible.com/sciencenews/ ]

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