Pterichthyodes milleri, Placoderm Pachycephalosaurus 5 million years ago having

5 million years ago having existed for approximately 11

and subsequently covered it up

But if you would rather forget we said that and instead reminisce on the more romantic "T

had an oval outline

dense and compact bones (penguins show a similar bone profile in cross section)

Pterichthyodes milleri, Placoderm Pachycephalosaurus 5 million years ago havingPterichthyodes is a genus of antiarch placoderm fishes from the Devonian period. Its fossils have been discovered in Sandwich Fish Beds of Ouoyloo, Orkney Islands, Scotland. They were one of the first species recognized for what they were, as their fossils are common in the Old Red Sandstone formation studied by geologists in the early 19th century. Due to their extreme divergence from modern day fish, they were a puzzle unsolved until Charles Darwin