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Inb4 the t rex is agreed to have had long, fleshy, limp whip arms that were far longer than the tiny bones.
Mammals are different than reptiles. A better comparison would be today's reptiles.
All birds are descended from the theropods that survived the Cretaceous–Paleogene extinction event
https://www.birdlife.org/news/2021/12/21/its-official-birds-are-literally-dinosaurs-heres-how-we-know/
