Dinosaurs were hatched as new offspring from eggs laid by female dinosaurs. Their eggs were identified and described for the first time in 1859. These eggs were elongated or round and had brittle shells. Other than oval and elongated some potato-shaped, football-shaped, grapefruit-sized eggs have also been observed. There have been different egg placements such as in the groups of 5-25, in the circle-shaped, and spiral-shaped arrangement. While some dinosaurs also laid eggs in rows.