Om Nom bird is a remake of Om nom from cut the rope.
Om Nom bird has got the ability to eat candy pigs. It's unknow why he doesn't like to eat normal pigs, maybe because he doesn't like meat or he considers them as friends, cause they are green like him. However, candy pigs are hard to destroy and Om Nom bird is extremely useful against them.
Om nom bird hasn't got teeth outside like it has in the original game, but they are hidden in his bill.