Spinosaurus

Spinosaurus is a dinosaur boss with a large, crocodile like head, a large red sail with black stripes on its back and a green body and numerous scars on its body, including a bite mark on the underside of its neck and a large bone lodged in its shoulder.

Defeating the spinosaurus unlocks the achievement: Like It Never Happened...

Gameplay
When the player encounters it, it will roar at them and then dive under the tar. It will start swimming back and forth with its sail exposed, taking around 6 seconds to go past the other side of the screen. The player must jump over the sail to avoid taking damage. After going across 2 times, the spinosaurus will then partially emerge from the tar and swim at the player mouth open and destroying the stones infront of it. The player must jump and land at the bone lodged in its shoulder to deal damage and stop it in its tracks. When it disappears from view, the rocks it destroyed come back.

The cycle then repeats, only this time, it will take one second less to reach the other side while swimming, bubbles will also sometimes start to appear under the rocks the player is standing on. After 2 seconds, the spinosaurus will lift its head out of the tar and crush the rock in its mouth and dive back under, leaving less space for the player to move out of the way. The spinosaurus will then move across one more time before finally resurfacing.

Every time the spinosaurus gets hit. It moves faster and can destroy an extra rock. After 4 hits, the bone gets push deep into the spinosaurus, causing it extreme pain and it slowly sinks into the tar. A path of rocks appear and the player can reach the shore to move on to the next world.