In addition to its 3 huge horns this dinosaur had spikes surrounding its sometimes nearly 10-foot-long skull

Jurassic Park fans will surely know of this small fast dinosaur with a huge claw on each foot

This dinosaur with a spike tail & plated back was once thought to have 2 brains due to an enlargement in the spinal cord

Brontosaurus comes fairly early alphabetically in dinosaur names & it was once classified by this name that's even earlier

Diplodocus was a type of this meaning lizard foot