Scientists have uncovered a group of baby duck-billed dinosaurs from a slab of rock in a part of Mongolia that is quite fossil-rich, known as Dragon's Tomb. The remains were found near the fragments of eggshell indicating that the dinosaur babies were in the earliest stages of development.

As per the researchers, these fossils belonged to a group known as Saurolophus angustirostris. It is being considered that all of these creatures were from the same nest.

For now, the researchers are not sure about the fact that whether the creatures were still in the eggs or died just after they hatched. But the researchers are sure of one thing that they were dead and partly decomposed when they were buried.

At least, three new baby Saurolophus angustirostris fossils have been discovered. The researchers think that the rock was a part of the dinosaurs' nest. Explaining about Saurolophus, it was large duck-billed hadrosaurs having a rare type of crests on the top of their heads.

After seeing the sizes of Dragon's Tomb hadrosaurs, it can be said that they were the youngest Saurolophus angustirostris ever described. These fossils may help paleontologists to know better about the changes that take place in the animal's body as it grows from 1 foot to 40 foot long adult.

One of the major changes can be seen by looking at the babies' snouts. "While hadrosaurids are considered the so-called duck-billed dinosaurs, we saw a very small snout [compared to adults]", affirmed study's lead author Leonard Dewaele, a researcher at Ghent University in Belgium.