In order for birds to fly they need light and often hallow bones. Because of this they can easily be broken and do not easily form fossils.
Hildegarde Howard has written: 'Fossil birds; with especial reference to the birds of Rancho La Brea' -- subject(s): Paleontology, Birds, Fossil, Fossil Birds 'Postcranial elements of the extinct condor Breagyps clarki (Miller)' -- subject(s): Paleontology, Breagyps clarki 'Fossil birds' -- subject(s): Birds, Fossil, Paleontology, Fossil Birds 'Fossil birds from the Anza-Borrego desert' -- subject(s): Paleontology, Birds, Fossil, Fossil Birds 'Pliocene birds from Chihuahua, Mexico'
The fossil record suggests that the earliest known bird capable of powered flight was Archaeopteryx, which lived around 150 million years ago during the late Jurassic period. This indicates that birds began to fly during the Mesozoic Era.
One of the first birds (which descend form dinosaurs) is represented by the fossil Archyopterix.See the link I will place below for a picture.
Tommy Tyrberg has written: 'Pleistocene birds of the Palearctic' -- subject(s): Birds, Fossil, Fossil Birds, Paleontology
While the birds are the only currently living animals (specifically vertebrates) with feathers, the fossil record clearly shows that some species of the reptiles (specifically the dinosaurs) had feathers (and these are the ancestors of the birds).
They were thought to have gone extinction because they disappeared from the fossil record around 65 million years ago. It is now known that birds are the only dinosaurs to have survived.
yes there are.
ARCHEOPTERIX
Robert M. Chandler has written: 'The wing of Titanis walleri (Aves:Phorusrhacidae) from the late Blancan of Florida' -- subject(s): Birds, Fossil, Fossil Birds, Paleontology
They looked like fish and birds.
Dinosaurs most resemble birds and reptiles but mainly birds because birds evolved from dinosaurs.
But they did. Specifically, birds evolved from a subgroup of dinosaurs (which were reptiles) known as theropods. There is a lot of fossil and anatomical evidence for this.