Long before the demise of dinosaurs, modern birds originated a hundred million years ago. Studies have shown discrepancies between results from fossils and genetic analysis, in searching for the first ancestors of modern birds. Archaeopteryx was a Jurassic period bird which had teeth in its beak and is a connecting link between reptiles and birds. The modern birds originated 60 million years ago, as suggested by fossil records, after the end of the Cretaceous period about 65 million years ago when the dinosaur died off. The toothed bird got extinct in the Cretaceous period itself.