This mosasaur tooth measures 4″ and weighs under .5 lbs. This tooth is a resin casting of a Mosasaur tooth with matrix. Mosasaur were the largest lizards that ever evolved. The Mosasaur grew up to 60′. The bite of the Mosasaur was as deadly as the T-Rex! Mosasaur ate large fish and were alive during the Cretaceous period around 125 million years ago. This unique tooth is the perfect gift for any dinosaur lover!