Many of the experts who looked at the photographs pronounced them to be important new support for the theory that birds descended from dinosaurs.

When the birds descended for the feast I shot them.

Slowly, the bird descended, opening its claws to perch on the rim of the nest.

As the birds descend, the water pressure increases, decreasing the volume of the trapped air.

Suddenly, a giant flaming bird descends upon the two.

But the bird descended like a bomb and its talons struck Brand about the head once again.

In the far ago land the door of his death glided wide, And the bird descended.

They also presented this as a reason for doubting that birds descended from dinosaurs.

The bird was descending, Icebones saw, curious despite her pain.

Basically, the Avialae include the ancestors from which modern birds descended.