Sentences with phrase «ancestors of birds»

If true, the results suggest that human sleep patterns evolved by around 300 million years ago in a common ancestor of birds, mammals and reptiles.

A common ancestor of birds and mammals may have had a membrane for protecting the eye and sweeping out debris.

THE DESCENT OF BIRDS Dinosaur ancestors of birds shrank steadily for more than 50 million years.

The dinosaur ancestors of birds shrank steadily for more than 50 million years.

As for the disappearance of the terrestrial ancestors of our birds, that part of the puzzle remains unsolved.

Like modern amphibians, the remote ancestors of birds once had three bones in their upper ankle.

For the past two decades, scientists using cladistics have claimed that dromaeosaurs were nonavian ancestors of birds, representing the best examples of how ground - dwelling dinosaurs supposedly evolved into birds.

Sustained miniaturization and anatomical innovation in the dinosaurian ancestors of birds.

But all those feathered dinosaurs were theropods, flesh - eating dinosaurs that include the direct ancestors of birds.

Albeit not being feathered, it was added to their names because they are likely the early ancestors of birds.

It belongs to a group called the oviraptorosaurs — funny - looking feathered dinosaurs with sharp beaks which were ancestors of birds.

The analysis reveals that the ancestors of birds shrank without interruption.

In dinosaurs, which are the ancestors of birds, this bone is tube - shaped and reaches all the way down to the ankle.

In addition to solving the mystery of flap running, the findings may shed light on the evolution of flight in the ancestors of birds, dinosaurs.

Like all modern paleontologists, Therrien was acquainted with the spectacular feathered - dinosaur fossils of the Liaoning beds in China, where the idea that dinosaurs are the ancestors of birds got its biggest boost, thanks to the preservation of feathers — both the thread - like ones known as «dinofuzz» and the more familiar shafted kind — in the silky mud of an ancient lake bottom.

If Czerkas understood cladistic analyses, he would realize that none of us ever said that dromaeosaurs were the ancestors of birds.

There has to be some particularly important feature attached to feathers that makes them so unique and caused them to spread so rapidly amongst the ancestors of the birds we know today,» explains Koschowitz.

But once the ancestors of birds started shrinking, he says, «they could start climbing trees, they could start experimenting with gliding and leaping — and ultimately they started flying.»

But once the ancestors of birds started shrinking, Lee says, «they could start climbing trees.