Prehistoric Hippo Potholes are the First Fossil Mammal Swim Traces
The fossil record is full of mysteries and surprises, like the first swimming mammal tracks ever found... Ancient hippo swim tracks might help paleontologists look for evidence of swimming dinosaurs.
Prehistoric Hippo Potholes are the First Fossil Mammal Swim Traces
Prehistoric Hippo Potholes are the First Fossil Mammal Swim Traces