The first dinosaur was about the size of a horse.
That's A Good Question! The First Dinosaur Was The Euraptor. It Was The Size Of A Chicken! I Think Looking At A Dinosaur The Size Of A Chicken Is HILARIUS!
A dinosaur is not a mammal. And some dinosaurs were bigger and some smaller.
No, they were reptiles.
Well first Andrewsarchus wasn't a dinosaur or a reptile it was a placental mammal that lived after the dinosaurs during the ice age.
No, the rhinoceros is a mammal.
The Dinosaur.
No, an elephant is in the mammal family.
The first dinosaur models (life size and made of concrete) were made by Benjamin Waterhouse Hawkins of England in 1854.
Yes. The distinguishing features of a mammal are warm blood and suckling their young, both of which the rhinoceros has.
Dinosaurs were endotherms
No it was a mammal that is related to the modern armadillos. It is now extinct.
It was a huge dinosaur - the fore-runner of reptiles.