hmm
I don't think some of you understand this.. actually he doesn't want to scare the dog or the duck .. as the dog barks to talk and the duck does the annoying ducky noise , the pterodactyl does the roaring noise .. which scares the animals.. and finally when he finds a mate and actually hears the sound from another one of his kin he gets scared too , and that makes the girly-bird sad. And that's why this is actually kinda funny.