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Birds and crocodiles share the same ancestor... and so do dinosaurs. they are in the same clade. Both birds and crocodiles build nests, brood their eggs, "sing" to attract a mate and also have four chamber hearts. It has been reasoned that because the dinosaur, bird, and crocodiles all homolgous, dinosaurs TOO built nests, brooded their eggs, sang and also had four chamber hearts.

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Angus Koepp

Lvl 10
4y ago

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