I listen to a lot of peoples' theories on many different subjects, and one of the theories I remember reading about in the past was the one where some people believe that dinosaurs evolved to be the birds that we see flying around in the modern world.
They think that in order to adapt to the changes that were occurring on Earth, the dinosaurs had to somehow get smaller, therefore, they became birds.
I don't know if this has any chance of being true or not, but it is a very interesting theory, and it kind of makes you wonder...
