Across
- 2. when a species has no living members
- 5. the largest shark to ever have lived
- 8. invertebrate that is considered a living fossil
- 9. the mineralized remains of prehistoric life
- 12. heaviest flying bird of all time
- 13. giant ancient relative of crocodiles
- 15. ancient group of birds known as "terror birds"
- 17. what many people think lives in Loch Ness
- 19. extinct relative of cephalopods
- 20. ancient relative of elephants
- 21. prehistoric group of marine reptiles closely related to snakes
Down
- 1. biggest primate ever
- 3. the largest snake to ever have lived
- 4. ancient fish that had armored jaws
- 6. the first bird
- 7. the first vertebrates to evolve flight
- 10. ancient whale that's name means "King Lizard"
- 11. ancient group of marine reptile that looked like fish
- 14. largest turtle to have ever lived
- 16. a group of extinct marine arthropods
- 18. extinct cat known for its teeth