A yellow-cheeked crested gibbon yawns in a cage at Cambodia's Phnom Tamau Zoo in Takeo province, about 28 miles south of Phnom Penh, Cambodia, last Friday. Unchecked development could threaten two rare monkey species, the yellow-cheeked crested gibbon and .black-shanked douc langurs, that were recently discovered in Cambodia's remote northeast, international researchers said Monday
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