9: Sauropods

These long-necked animals — a type of dinosaur rather than one species — come at number nine. Here, it's not a scary claw or a weapon that makes them fearful — it's their sheer size. 

"These are massive like Brachiosaurus, Diplodocus, Argentinasaurus," said Morrison.

"They are the biggest animals ever to walk the earth."

These animals could kill you just by stepping on you. Or even by stepping near you. A study found that turtles, dinosaurs, and crocodiles drowned in the footprint left behind by a sauropod walking through marshy ground, Morrison said.

"The sauropods walked a swampy marshy environment, really churned up the soil, and they made that sort of quicksand with their footprints," said Morrison. 

But it's not only their legs you should be careful of. In his book, Emory paleontologist Anthony J. Martin, with the help of physicist Jed Brody, calculated that the speed and weight of Diplodocus vomit falling from the height of its head would be enough to kill a dinosaur.

By extension this would also kill a human, said Morrison. 

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