           National Geographic Photo of the Day: Reef Scallop

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Photo of the Day   May 29, 2007    PREVIOUS [4]   |  NEXT [5]
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Near Yap Islands, Micronesia, 1995 Photograph by David Doubilet A
multi-colored scallop sits open-mouthed on a reef off the Yap Islands
in Micronesia. Unlike most mollusks, which tend to anchor themselves in
colonies and stay put, scallops have the gift of locomotion. They move
in short spurts by closing their mantle quickly, ejecting water and
jet-propelling themselves backwards.

Scallops also have the distinction of eyesight. Their eyes, sometimes
numbering more than a hundred, are quite sophisticated, each with a
lens, retina, and optic nerve. These tiny peepers line the upper part
of the mantle (seen as orange dots on this specimen) and work together
to detect shadows and movements.

(Photo shot on assignment for, but not published in, "Manta!," December
1995, National Geographic magazine)    RELATED
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