Mosasaur

Appearance
The Mosasaur has black skin and a white stomach with red eys and a whale like fluke (tail end)

Gameplay
The Mosasaur appears only in level 2-1 where it first appears breaking through the frozen water and eating a Prehistoric Badger, the Mosasaur then leaps out of the ice under location with bubbles under cracked ice

The Mosasaur appears again near the end of the level where it chases the player through the icy cave, it then gets its head stuck into the wall and the player can complete the level

Level Apperances

 * 2-1 Frozen Lake

Trivia

 * Despite not being a boss, the boss theme plays while running from it, which can lead to the confusion of it being one. [The same thing happens with the T-rex chase in 4-3 Trembling Trees]
 * Despite its name is "Mosasaurus", it is more like a Basilosaurus since it has a tail resemble to a whale, where Mosasaurus didn't possess. It also moves by beating its tail up and down, whereas mosasaurus moves its tail side to side. Mosasaurus also has 2 pairs of fins, but the one shown in game only has the front pair of fins, and has a dorsal fin just like a whale, which mosasaurus most likely did not have.