This new series by acclaimed artist, Kat Chadwick, allows small children to laugh out loud and play along with their grown-up readers.Poor Bird Brain meets so many pets, but which one says what? In Who Says Moo? Bird Brain can't remember who says moo. Is it horse? No, silly! Children love to say no, especially to grown-ups, and can delight in saying no, over and over again until, finally, the lift the flap on the last spread reveals cow is the animal that says moo!