Paleontologists have identified over 500 different genera and 1,000 species of non-avian dinosaurs.

They are found in salamanders, and in some non-avian dinosaurs.

However, all non-avian dinosaurs as well as many groups of birds did suddenly become extinct approximately 66 million years ago.

The family Dromaeosauridae, traditionally considered to be non-avian dinosaurs, have been included in this group by at least one author.

Though the non-avian dinosaurs were gone, the mammals, and other land animals remained small, none bigger than a large domestic cat.

Origin of avian genome size and structure in non-avian dinosaurs.

How long did it take for the dinosaurs (at least the non-avian dinosaurs)to die out completely?

Several non-avian dinosaurs had feathers on their limbs that would not have functioned for flight.

The majority of non-avian dinosaurs became extinct during that time.

This suggests that at least some non-avian dinosaurs were warm-blooded.