This allows for the study of the transition between dinosaurs and ancient mammals; research is ongoing.

Huxley was the first to propose an evolutionary relationship between birds and dinosaurs.

That work has turned out to offer additional evidence of a link between dinosaurs and birds.

The discrepancy between mammals and dinosaurs is even more striking.

Some theories are that competition between dinosaurs and mammals was the cause, or possibly climate changes.

"It's exciting to see another set of data to bolster our case for a close relationship between dinosaurs and birds."

This is expected to help them determine the anatomical differences, for example, between young and mature dinosaurs.

"It's exciting to find such a clear intermediary step between dinosaurs and the birds of today."

This posture provides another behavioral link between birds and dinosaurs.

Currently, the relationship between dinosaurs, Archaeopteryx, and modern birds is still under debate.