What dinosaur is cold blooded vertebrate that usually lays eggs?

Answer 1

All dinosaurs, including birds, which are considered a group within the clade Dinosauria, laid eggs.

It is unknown whether dinosaurs were warm blooded or cold blooded. Possibilities include:

• All dinosaurs were warm blooded, and none were cold blooded
• All dinosaurs were "lukewarm" blooded, meaning they had some control over their body temperatures, but not as much as modern warm blooded animals, like mammals or birds.
• All dinosaurs were cold blooded.
• Some types of dinosaurs were warm blooded while others were lukewarm or cold blooded.

The growth rate of dinosaurs as revealed by their fossilized bones and the fact that their anatomies suggest very active lifestyles, which cold blooded animals would not be able to maintain, among other pieces of evidence, strongly suggest that at least theropods were warm blooded, if not all dinosaurs. Theropods were three toed, bipedal dinosaurs, most of which ate meat. Examples includes T-rex, Velociraptor, Allosaurus, Troodon, and Ornithomimus.

In other words, it appears most likely that all dinosaurs laid eggs, but they were warm blooded.