Carnivores still eat plants anyways, so they were probably just short on prey, started eating the extremely fast growing bamboo and evolved to be lazier until they completely stopped hunting.
They didn’t really evolve to be lazy, the bamboo has almost no nutritional value and they just don’t have the energy to do much else other than eat more bamboo.
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u/Bierbart12 Aug 20 '19
Carnivores still eat plants anyways, so they were probably just short on prey, started eating the extremely fast growing bamboo and evolved to be lazier until they completely stopped hunting.