The big difference between angels and birds, he adds, is that the former's wings don't actually allow them to fly.

While there, she studied the relationships between birds and insects.

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

So, this makes me wonder quite a bit about the physiological differences between birds and mammals.

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

To conclude, there will be an association between red flowers and birds.

The final book is intended as a global chorus on the relationship between human beings and birds.

This collaboration between men and birds extended to the level of a partnership.

It is quite possible that there will turn out to be some significant differences between mammals and birds.

For example, there is no direct pathway between humans and birds.