Chang Liu et al. nine days ago found bone density genes in the African giraffe. It strikes me (belatedly) that this will help human-sized biota on higher-gravity planets.
I could easily see these being evolved in Permian-era "Mammal Like Reptiles". As soon as they get out of the swamps and evolve that ability to hoist their bellies off the ground.
In this scenario, I wonder if the Barbados flying fish, without those enhancements, evolves into a flying amphibian that roosts in island and lagoon trees and cliffsides. The atmosphere will be denser in such a planet, remember.
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