Question 2 of 21

When did dinosaurs first appear?

... Dinosaurs got their start as small, meat-eating creatures 230 million years ago.

Question 3 of 21

What was Parasaurolophus's main line of defense?

... The sensitive hearing and infrasound vocalizations of Parasaurolophus enabled it to transmit and receive warning signals over long distances.

Question 4 of 21

How long was the nasal cavity of Parasaurolophus?

... The 8-foot (2.4-meter) looping tube inside the dinosaur's nasal cavity acted like a trombone to amplify sound.

Question 5 of 21

Which armored dinosaur was covered in steel-like plates and wielded a 100-pound club at the end of its tail?

... The nearly impenetrable shields and swinging tail of Ankylosaurus made it a force to contend with.

Question 6 of 21

Which of the following was NOT one of the findings leading researchers to believe Sinornithosaurus was venomous?

... Like modern venomous reptiles, Sinornithosaurus appears to have had fang-like teeth, a venom gland and grooved teeth.

Question 7 of 21

What group of dinosaurs is characterized by a long sickle-shaped claw on the second toe?

... Along with their distinctive talons, Dromaeosaurs had strong, stiff tails, large grasping hands and were often feathered.

Question 8 of 21

How did Oryctodromeus cubicularis escape from predators?

... Along with using its burrowing skills to escape from enemies, Oryctodromeus may also have relied on its underground lairs to survive harsh weather conditions.

Question 9 of 21

What dinosaur holds the record as the world's largest carnivore?

... Spinosaurus, which also had the longest head of the meat eating dinosaurs, weighed up to 9.9 tons.

Question 10 of 21

How tall was the characteristic sail of Spinosaurus?

... When Spinosaurus arched its back, its imposing sail rose a full 6 feet (2 meters).

Question 11 of 21

What dinosaur had one of the longest life spans in the animal kingdom?

... The tallest land animal to ever exist, Sauroposeidon lived as long as 100 years.

Question 12 of 21

Besides being an almost foolproof form of protection, the neck frill of Triceratops might also have been used for what purpose?

... Triceratops' 6.5-foot (2-meter) wide neck frill may also have been used to help regulate its temperature.

Question 13 of 21

How did the teeth of Spinosaurus differ from those of most other carnivorous dinosaurs?

... Unlike the curved teeth common in other carnivores, the straight teet of Spinosaurus were likely used to spear slippery prey like fish, which probably comprised much of its diet.

Question 14 of 21

Which dinosaur probably had the best vision?

... The eyes of Tyrannosaurus, spaced 16 inches (41 cm) apart, could see fine detail for up to four miles (6.4 km).

Question 15 of 21

Why do researchers think T- Rex had an excellent sense of smell?

... Based on the size of its olfactory bulbs relative to its brain size, Tyrannosaurus likely had a nose as powerful as that of 1,000 bloodhounds.

Question 16 of 21

What feature of Archaeopteryx indicates it wouldn't have been a powerful flyer?

... Without a rounded breastbone for flight muscle attachment, Archaeopteryx most likely lacked strong flight skills.

Question 17 of 21

Many paleontologists believe birds likely originated from which group of dinosaurs?

... Maniraptorans, distinguished by their modified forelimbs, also include raptor dinosaurs like Deinonychus and Tyrannosaurus.

Question 18 of 21

Which dinosaur's remains provided some of the best evidence for extended parental care?

... The bones of Oryctodromeus were found inside a small burrow alongside two of its young.

Question 19 of 21

Which dinosaur likely hunted in packs?

... Groups of Deinonychus would have been capable of taking down prey several times their size.

Question 20 of 21

What family of dinosaurs was Parasaurolphus a member of?

... The hadrosaurs, or duck-billed dinosaurs, were known for their long, flattened snouts.

Question 21 of 21

What does the word 'dinosaur' mean?

... Richard Owen coined the word dinosaur from the Greek word deinos, meaning 'fearfully great,' and sauros, meaning 'lizard,' in 1842.

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