The Jurassic time period had lots of dinosaurs but they weren't the only ones. Mammal life began to make its appearance in the form of theropods. Previously reptilians from this period began to show signs of mammal evelution.

There were dinosaurs, birds, reptiles, amphibians, fish, and plant life.

Animal life

Theropods ⬆️
Transformation later on➡️

Theropods came from water and were the first mammal like creatures to take steps on land