Dinosaurs laid eggs, like most other reptiles as well as birds. In recent years, scientists have discovered dinosaur nesting sites that gave them an insight into the early life of dinosaurs. These sites showed that some young stayed in their nests, cared for by adults, until they were old enough to leave. They also showed that dinosaurs, like many birds, used the same nesting sites year after year.
Egg find The discovery of clutches of Proto-ceratops eggs was the first evidence that dinosaurs had nests. The shell of each egg had tiny air passages to permit gas excharge.
Small eggs These fossilized sauropod eggs, which are only 6 in (15 cm) in diameter, could have produced young that grew to an adult length of 39 ft (12 m). It probably took sauropods several years to reach their adult size.
Female Maiasaura laid about 25 eggs in a nest that was dug in the ground and lined with leaves and twigs. Young Maiasaura were about 12 in (30 cm) long when they hatched. They were reared in the nest until they grew to about 5 ft (1.5 m), when they would be old enough to start fending for themselves.
Maiasaura hatchings were very weak.
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