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DID YOU KNOW? --Some scientists have said that Camarasaurus, a giant plant eater, might have had a trunk, like an elephant's. They got the idea from looking at dinosaur's nostril holes, which are high on the skull. But no one has found a fossil that shows a trunk on a dinosaur. --Scientists have wondered for years how each kind of dinosaur protected its young. Some of them might have simply hidden their eggs and left them, as sea turtles do. But other dinosaurs guarded their young. Footprints made by big plant eaters show that these animals moved in herds, with their young in the middle of the group. And sometimes adults might have fought predators to protect their babies. --Telling the age of fossilized things such as dinosaurs is not always easy. Scientists estimate the age of a dinosaur by the age of the rocks in which its fossils were found. Not all rocks can be dated. But some contain chemicals that break down at a steady rate over time--a sort of rock clock. By measuring how much these chemicals have changed, scientists can calculate a rough age for that rock. --Not much is known about the body organs of dinosaurs, since their soft insides were not preserved as fossils. But it's likely that their bodies were similar to those of birds, which are the descendants of meat-eating dinosaurs. This is why scientists think the dinosaurs had hearts, lungs, digestive systems, and so on. --The last tale involves the dinosaur tail. Balance was probably the main purpose of a dinosaur tail. Unlike the old idea about dinosaur posture, two-legged dinosaurs leaned forward when they were standing, walking and running. Dinosaurs held their tails out to help balance their weight in the front, so think the scientists. Some four-legged dinosaurs, such as the club-tailed dinosaurs and the giant plant eaters, might have swished their tails to defend themselves against attackers.
ANSWER: No time at all, because the first dinosaur already filled it! |
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