It says that before Adam and Eve sinned there was no death. Also before the fall animals didn't eat eachother. Animals and humans were vegetarian.
So, necessarily, animals didn't reproduce before the Fall, or they (flies and cockroaches in particular) would have been chest-deep to a tall giraffe. And those carnissal teeth that the Cat Kind had were for subduing the wily and fierce Jurassic Carrot, which, like other vegetables back then, could be eaten without dying. Yeah.