Answer: iguanodons

AnswerCrossword Clue
iguanodonsIGUANODON, a genus of gigantic herbivorous dinosaurs having a birdlike pelvis and large hind legs
iguanodonsA large, partly bipedal, herbivorous dinosaur of the early to mid Cretaceous period, with a broad, stiff tail and the thumb developed into a spike