At the end of the Cretaceous Period, a type of giant reptile called mosasaurs occupied and dominated oceanic food webs. Mosasaurs had long bodies and were related to both snakes and monitor lizards.

The scientific wonderers at What If bring prehistoric seas into the present by imagining Megalodon battling Mosasaurus in ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to curiouskidsus@theconversation.com. When did the megalodon shark go extinct, and why ...