Our ancestors were TINY? #mammals #evolution #dinosaurs

The very first true mammals were tiny. They would have been covered in hair. They would have had molar teeth. They would have fed their babies milk. You would recognize them as mammals, but you would probably just think they were some kind of little rodent scurrying around. — It wasn't easy for the newly evolved mammals, as the dinosaurs reigned for roughly the next 160 million years. — The fates of dinosaurs and mammals have always been intertwined. And while dinosaurs took over the world, mammals went the other way. They went small. They evolved stronger jaw muscles so they could bite harder. They evolved a keener sense of hearing. All these things would have helped them survive in a world controlled by massive enormous dinosaurs that could have smashed one of these little mammals with a single footstep. It would be primarily the smallest of the mammals that would survive the next major crisis, the asteroid strike that wiped out the dinosaurs 66 million years ago.