These are Giant Clams that I photographed on the Great Barrier Reef. These Giant Clams live in warm shallow waters in the south pacific. They can grow quite large (several feet), but most of these are less than a foot across. They are filter feeders and are open most of the day. They close very quickly if startled or if a shadow moves over them.
One of the most interesting things about these clams is that each one is a different color and pattern. Some are bright colored, others have intricate patterns, and some are relatively plain.
Michael Fuchs Photography 
It would be really neat to see some very large clams sometime!
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We saw these a lot in the Pacific Islands. The varied colors are amazing given that they can be several different colors in one area. In the islands they use them as a food source, but given how long it take them to mature there are areas now that are protecting them.
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At first glance, I thought this was one of your amazing aerials – a photo of a gorge. It acted as a reminder of the wonderful variety of your work. From the stars to the tiniest animals.
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Great photo! Those clams are amazing creatures…
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