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Physiology

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By carrying sponges in their beaks while they hunt, dolphins may be able to sweep away much more sand from the ocean floor and scare up new types of food. Analysis of the animal's fatty acids support this idea.

Sexual competition persists long after mating, all the way down to the proteins that put an efficient head on a swimming sperm.

SMELL DETECTORS  A researcher whiffs a scent-containing vial used in experiments indicating that people can identify at least 1 trillion different odors.

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