Feathers have been found on certain dinosaur fossils and, like birds, they give birth via eggs but :
Fish also give birth via eggs
The body plan of birds is nothing like that of dinosaurs
Feathers could be evolutionary remnants from previously evolved birds
No truly intermediary species between bird and dinosaur has been unearthed. (The archaeopteryx is not generally accepted as fulfilling this role.)
Feduccia claims that Sinosaurotpery (see photograph above) ,the small fossil recently found in China, an earlier discovery of which was first described in Nature in 1998, was erroneously jumped upon as evidence for dinosaurs from birds. To quote: ‘...no evidence then or now has emerged showing that these structures are anything other than collagen fibres supporting a typical reptilian frill. The fact that they were located within a clearly demarcated body outline ...was completely ignored.’ He also points out that 'current orthodoxy dictates that the entire suite of avian flight architecture, including aerodynamic wings and specialised brain structures, evolved in earthbound dinosaurs...’ To me as an outsider this does seem a stretch on credibility.
It would all be a lot simpler if fossilised birds were found. Unfortunately, they are by necessity so finely constructed that they do not lend themselves to fossilisation, so we may have to wait for a clearer picture to emerge. It is a case of absence of evidence not being evidence of absence. But this does seem to me another example of evolutionary biologists seeing what they expect to be there rather than what is in front of their eyes.
What gives me, with no training in biology or zoology or paleontology, the right to comment? Nothing. But sometimes people from outside the field can see things afresh or stimulate a professional scientist to think outside the box of the current dogma or say things which may risk prejudicing his career or credibility but which nevertheless need to be taken seriously.
Reach me at firstname.lastname@example.org
See also http://www.cs.unc.edu/~plaisted/ce/hagfish.html