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A male I. palawanense is seen on a rock in Palawan. The species is widespread throughout the Philippine island, unlike the other three newfound species, which are restricted to small home creeks or rivers. (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.