Classify each of these as extinct, not extinct, or neither: Mythosaur, Triceratops, Dumbo Octopus, Dodo, Tiger, Lion turtle, Megalodon, Dire wolf, Pegasus, Seahorse

Extinct: Triceratops, Dodo, Megalodon, Dire wolf
Not Extinct: Dumbo Octopus, Tiger, Seahorse
Neither: Mythosaur, Lion Turtle, Pegasus