Dinosaur- a reptile of the Mesozoic era, often reaching an enormous size. Maybe some of these reptiles aren't considerd dinosaurs, I'm really not sure. They did live with dinosaurs which is all that matters to me.
http://www.ranker.com/list/the-most-badass-dinosaurs-of-all-time/stokified,
Euoplocephalus
This is probably the most badass herbivore dinosaur of all-time. 20 ft. long and 2 metric tons. Dinosaur with the best defense mechanisms of all-time.
Therizinosaurus
Forelimbs were 8 ft. long. 1 claw is over 3 ft. Was not even a carnivore. 35 ft. long and 3 tons.
Dilophosaurus
23 ft. long. Up to 2,200 lbs. In Jurassic Park this is the dinosaur that spit poison with a neck frill, which is incorrect. Nothing supports how the movie portrayed version of this animal. It still is pretty badass though.
Jeholopterus
3 ft. and 10 lbs. Just think of this as a huge bat that you really don't want to run into. It's basically 3x the size of a modern day bat.
Kronosaurus
30 ft. long with sharp teeth. Named after Greek Titan leader, Cronus.
Deinonychus
Best overall type of raptor that ever lived. Extremely fast and pack hunters. 12 ft. long and 150 lbs. Incorrectly portrayed in Jurassic Park. Deinonychus is Greek for terrible claw.
Sarcosuchus
Weighed 8 metric tons. 35-40 ft. long. 10x the size of the average fresh water Croc. Sarcosuchus means flesh Crocodile. 132 large and sharp teeth.
Quetzalcoatlus
One of the largest known flying animals of all-time. 35 foot wingspan. Very sharp and pointed beak. Named after Mesoamerican serpent God, Quetzalcoatl.
Giganotosaurus
This is basically a T-Rex that is bigger and weighs 2 tons more with sharper teeth.
Troodon
The smartest dinosaur of all-time. It's name in Greek means wounding teeth. Omnivorous (eats everything) diet. 8 ft. long and 110 lbs. Teeth looked like saw blades.