From Plants vs. Zombies Wiki
Terrible Lizards and Tall Dinosaurs run amok! We are in La Brainsa Tarpits!
Level 13, Dinosaurs are everywheres.
Level 13 again, I think they are under control
Level 14... That's a lot of Pterodactyl's
Level 23, DINOSSS! This is getting difficult!
Level 25, Primal madness!
Level 25: GARG GET AWAY FROM ME!