Is a Sargassum a bird?

dinosaurs are birds they turned into birds, birds lay eggs and they get more birds

When it does not have any wings, a beak and has teeth.

It is a perching bird (passeriform), and is considered a songbird.

No. Scientifically, if a bird is not a bird, then it would be obviously considered as a female hippopotamus.

There is not particular bird. Birds are just a transport medium for the virus.