The Dinosaur Heresies: New Theories Unlocking the Mystery of the Dinosaurs and Their Extinction is a 1986 book written by Robert T. Bakker[1][2] exploring extant evidence indicating that dinosaurs, rather than being cold-blooded and wholly lizard-like, were warm-blooded, agile creatures more similar to modern birds than to lizards or other reptiles.

Although controversial on publication in 1986,[3] much of The Dinosaur Heresies now represents the prevalent view in paleontological circles (although other parts have been outdated by more current research).

[citation needed] The main arguments used to show that dinosaurs were warm-blooded are:

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