Synthetoceras tricornatus poster Mammut Koolasuchus was a giant brachyopoid

Koolasuchus was a giant brachyopoid temnospondyl from the Early Cretaceous of Australia

or if it happened because of sudden catastrophic events

Governor Doug Ducey signed the bill into law which made this brachiosaur Arizona's official dino

Spinosaurus was a massive sail-backed predator that spent much of its life in the water

By Andrey Atuchin

Synthetoceras tricornatus poster Mammut Koolasuchus was a giant brachyopoidThe males of this extinct ungulate were armed with a distinctive Y shaped horns that grew above its snout. Such a strange forked structure could have helped them intimidate each other to settle territorial disputes.