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Large Insulamon males—such as this I. johannchristiani, another of the newfound species—sport a reddish color, possibly to signal their power. Smaller, less dominant Insulamon males and females are purple. (Photograph courtesy Hendrik Freitag) See more photos at National Geographic.com

Newly discovered purple crabs

Four new species of colorful crustaceans have been discovered in the Philippines, a recent study says. The crab's brilliant hues may simply help the species recognize its brethren, said study author Hendrik Freitag, of the Senckenberg Museum of Zoology in Dresden, Germany.