Researchers at Delhi University in India say they have uncovered a plethora of titanosaur eggs that shed new light on how the dinosaur species reproduced and cared for their young.
The research, published in the journal PLOS ONE, documents fieldwork between 2017 and 2020 that led to the discovery of 92 nests and 256 eggs located in the Lamenta Formation – rock layers that are notable for dinosaur fossils.
Scientists identified six "oospecies" or egg species, which points to a possible high diversity in dinosaur groups found in India.
In addition, the scientists found "ovum-in-ovo" eggs or multi-shelled eggs, and it was the first time that had been discovered in the nests of titanosaurs. They are usually found in birds.
With the discovery of the multi-shelled eggs, researchers now believe this group of dinosaurs was similar to birds, making them capable of sequentially laying their eggs
Because of this finding, scientists believe there are similarities in reproductive systems in reptiles and birds.
The dinosaur nests were made up of egg clutches in three patterns: circular, combination and linear. And scientists believe that once they laid their eggs, they didn’t stick around to care for their young.
"Parental care must have been absent as the size difference between juvenile and parent dinosaur is enormous and clutches are closely spaced," the scientists wrote. "This also supports precocial behavior of juveniles which must have left clutches soon after hatching."
So, it's believed that soon after the dinosaurs hatched, they left the nest to explore the world on their own.