WASHINGTON : Fossils unearthed in China are helping scientists get a better grasp on one of the marvels of evolution: the giant panda's false thumb, which helps this veggie-loving bear munch the bamboo that makes up most of its diet.
The false thumb is an evolutionary adaptation to augment the existing five actual digits of the panda's hand. A bear's hand lacks the opposable thumb possessed by humans and various primates that enables the grasping and handling of objects using the fingers. The false thumb serves a similar function.
"The hooked false thumb offers a tighter grasp of the bamboo and, at the same time, its less-protruded tip - because of the bended hook - makes it easier for the panda to walk. Think of the false thumb as being stepped on every time the panda walks. And therefore, we think that is the reason that the false thumb in modern pandas has become shorter, not longer," Wang said.
Pandas, one of the world's eight bear species, once inhabited large swathes of Asia. They now live primarily in temperate forests in the mountains of southwestern China, with a wild population estimated under 2,000.
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