Probably because they evolved in such a relatively small area where bamboos were a predominant part of the vegetation. Therefore no need for them to eat anything else so their digestive systems stopped being able to digest anything else. Bamboos are a type of grass, really, and many other animals have become grass-specialists. It involves a complex relationship with bacteria in the gut and the structure of the gut is different for grass-eaters than general foliage feeders. So, if bamboos became extinct, so would giant pandas ....
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Originally Posted by scobey
Don't they also only eat bamboo and nothing else? Why is that?  |