In the 1980s, paleontologists and other scientists put together an elegant scenario accounting for the enormous mass extinction that took place at the end of the Cretaceous Period of the Mesozoic Era. That scenario entailed the following events ( Read more... )

http://news.discovery.com/animals/pre-dinosaur-burrows-110913.html

Long before dinosaurs, something was digging intricate homes and roads underground. While life on Earth 240 million years ago flourished in the seas and on land, the underground ( Read more... )

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Early kangaroos had fangs and ran on all-fours - Telegraph

And see Fauna of Australia for more information.

H. P. Lovecraft's character Cthulhu is a gargantuan life-form that is clearly animal-like, if not a true terrestrial animal (his origins are presumed to be extraterrestrial). He is enormous, about the size of Godzilla or larger. If he is an air-breather -- and from the stories it's clear that his biochemistry requires oxygen, just as ours does ( Read more... )