No, they were reptiles.
A dinosaur is not a mammal. And some dinosaurs were bigger and some smaller.
The first dinosaur was about the size of a horse.
No, the rhinoceros is a mammal.
The Dinosaur.
No, an elephant is in the mammal family.
Yes. The distinguishing features of a mammal are warm blood and suckling their young, both of which the rhinoceros has.
No it was a mammal that is related to the modern armadillos. It is now extinct.
No the blue whale is an aquatic mammal
It was a huge dinosaur - the fore-runner of reptiles.
Dinosaurs were endotherms
Mastodon was a relative of elephants and mammoths. It was a mammal, and not related to dinosaurs.
I think it's a dinosaur.