Acrocanthosaurus has been the subject of debate regarding its taxonomic classification

Height 85mm

which means "polar bear"

Height 46 mm

This ancient cetacean has become an important transitional fossil in understanding the evolution of marine mammals

Koolasuchus cleelandi Archaeopteryx Acrocanthosaurus has been the subjectKoolasuchus cleelandi, an extinct giant temnospondyl, emerges as one of the most formidable predators of the ancient Australian landscape. Approximately 120 million years ago, during the early Cretaceous period, in the Barremian, this imposing amphibian reigned over the rivers and streams of what we know today as Australia. Discovered in 1989 by paleontologist Lesley Kool and geologist Mike Cleeland, Koolasuchus cleelandi is known from jaw fragments