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Biologist records sequence that shows Palau fish using rock to crush a clam
A fish using tools to crack open a stubborn clam shell has been caught on video for the first time.
The clip, shot in 2009 off the Pacific island of Palau, shows an orange-dotted tuskfish (Choerodon anchoago) digging a clam out of the ocean floor and carrying the clam in its mouth to a rock. Next, the fish repeatedly tosses the clam against the rock to crush it.
The video was analyzed, and research based on the observations was published online Sept. 20 by the journal Coral Reefs.