Paris, France, March 2, 2007—A veterinarian feeds Tivalo, a baby crowned sifaka lemur, at the Vincennes Zoo. Because his mother had problems nursing the infant—one of two lemurs born at the zoo in January—doctors had to feed him by hand. (Related: "Threatened Lemurs' Diet Key to Conservation Efforts, Researchers Say".)

Almost all of the more than 70 known lemur species—which are found only in the African island nation of Madagascar—are endangered by habitat destruction, but the crowned sifaka's situation is especially dire. The International Union for the Conservation of Nature estimates its population at only between a hundred and a thousand individuals.

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