This bipedal green dinosaur with a long tail and purple thorns is called T-Rex and is a reptile from Jurassic times in the arcade game Plants vs. Zombies. The T-Rex is a dinosaur which behavior is similar to a dog and whose roar temporarily increases the speed of zombies in his lane. Tyrannosaurs turn all backward-facing zombies and walk away after their first roar. The T-Rex can also chomp on passing zombies and leaves after chomping 5 zombies. The Plants vs. Zombies cursor for a mouse with T-Rex!