Everything changes through evolution and crap like that birds dogs cats giraffes pandas tigers chickens dinosaurs etc. As time changed the dinosaurs adapted some becoming birds (who actually fly) others becoming other things. Theses change occur between "generations" the changes are evident in the off spring but i is to tired to continue this i going to take a nap and try to explain to my self why im on the ceiling.-.
So what you're saying is, TWO DIFFERENT DINOS THAT HAVE NO SIMILARITIES TO A CHICKEN HAVE INTERCOURSE AND LAY AN EGG. THE EGG HATCHES AND A CHICKEN POPS OUT.