Dinosaurs, like all modern birds and most reptiles, laid eggs. This set consists of eggs and babies of four different dinosaurs:
In recent years, many fossilized dinosaur eggs and nests havebeen discovered, although we aren't always sure what kind ofdinosaur they belong to unless there are identifiable bones in thenests with the eggs. Each species of dinosaur has its own egg shellstructure and texture, so even a small shell fragment can oftentell us what dinosaur laid the eggs. Typically, the parent dinosaurwould dig a shallow pit, and lay the eggs in it. Each species ofdinosaur appear to have laid the eggs in a characteristic pattern(e.g., in a ring, or standing on end, or even in a closely packedheap), and then cover them with soil or vegetation. In some cases,many nests have been found close to each other, indicating thatthese dinosaurs gathered together in large groups during the layingseason to form a rookery, much like seals, penguins and many otherseabirds do today. This would have provided some protection againstpredators, and would make it easier for the parents to care for thehatchlings until they were old enough to fend for themselves.