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Giant panda’s ancestor was a carnivore.

When it came to The Ice Age, extreme coldness forced Ailuaractos lufengensis (ancient pandas) and other carnivores into a narrow habitat.

Available food shrank in scale, forcing the ancient pandas to turn herbivore.

Subsequent increasing survival pressure has further changed the giant panda into eating hard-to-digest and unwholesome bamboos.

More info: lovelypanda.net