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This is only a partial answer (it only addresses land animals), but I don't know if anyone else is going to mention it, so I might as well. Land animals rely on their bodies to support their weigh...
Answer
#1: Attribution notice removed
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System
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2020-06-01T14:13:37Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/1392 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/