this post was submitted on 15 Nov 2023
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I think it's a bit more complicated than that, blue whale are hyper efficient, they collapse their lungs to get all the oxygen they breath in into their blood stream, so they use the gas the breathe in many times more efficiently than a terrestrial mammal.
They also have hyper efficient heat retention, muscle use, everything. They are fully adapted for their milleaux, it's apples to oranges to compare them to a terrestrial bird/lizards that were mostly cold blooded and hollow boned.