What animals were in the mesozoic era

Like lions elephants more like the wild animals

There were far too many types of animals to list them all, but here are a few: 
In the Air: 
Insects 
Pterosaurs 
The first birds (some of which had teeth) 
On Land: 
Dinosaurs 
Small mammals (multi-tuberculates, placentals, marsupials, and monotremes) 
Lizards 
Amphibians (frogs, salamanders, and the last temnospondyls [huge, toothed amphibians]) 
Insects 
In the Ocean: 
Fish 
Coral 
Sharks 
Plesiosaurs (marine reptiles, some of which had long necks) 
Icthyosaurs (marine reptiles that looked like fish) 
Mosasaurs (huge marine lizards) 

These are just the main categories of animals that lived during the Mesozoic. For individual types, you might want to research each individually. Hope this helps! :)