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Why are the biggest animals herbivores? - Video học tiếng Anh
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Why are the biggest animals herbivores?
Why are the biggest animals herbivores?
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0:00
These mega-creatures meet their mega-calorie quota with something that’s super-abundant and
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requires almost no effort to procure: little pieces of grass and leaves.
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And sure, leaves and grass aren't very calorie dense compared to things other animals eat,
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but the giants’ giant digestive tracts can hold a LOT of them at once - we’re talking hundreds
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of kilograms. Plus, the bigger an animal is, the longer the food stays in its digestive system,
0:21
and the more microbes there are in there to break it down. All of that means that
0:25
the giants are able to wring a lot of calories from grass and leaves - enough
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to meet their huge calorie demands. The abundance and ease of finding
0:32
leaves and grass are why - at least on land - you see the same pattern in every biome:
0:36
the very biggest animals are herbivores. Even back in the day when dinosaurs roamed the Earth, the
0:41
biggest animals weren't predators like T. rexes – they were lumbering leaf-eating vegetarians.
