👉 Mastacembels are a group of extinct mammals that lived during the Late Cretaceous period, approximately 68-70 million years ago. They were known for their distinctive long, flattened bodies and large brains with two eyes in each eye, which allowed them to see through air. Mastacembels were primarily herbivores and had a high metabolic rate due to their large brains. Mastacembals are characterized by a single, long toothed jaw that is used
