Although a few dinosaurs were adapted to live underwater, most dinosaurs were landlubbers through and through. And perhaps no dinosaur had less business going for a swim that this fellow, the heavily-armored, 13,000-pound Ankylosaurus.
That's why it's so bizarre that the fossils of one of these tank-like behemoths was found in the Suncor mine of northern Alberta, a sediment area associated with marine environments of the early Cretaceous. Somehow, this dinosaur lived all its life on land, yet managed to spend the next 110 million years underwater - give or take some major rearrangement of the continents around it, of course. Dinosaur Tracking explains the bizarre chain of events that deposited this dinosaur so ludicrously outside its natural habitat:
This ankylosaur must have lived along the coastline of the great Western Interior Seaway which once split North America into two. But that was many, many miles away from where the skeleton was found. Exactly how the dinosaur died is unknown, but...the carcass undoubtedly floated upside-down through the sea. The gases from decomposition gave the body enough buoyancy to travel-what paleontologists commonly refer to as a "bloat and float" scenario.
For those wanting to learn a lot more about this strange new find, there's an hour-long lecture video at the link.