Watch out - it bites! The LEGO Harry Potter Chomping Monster Book of Monsters (76449) brings Hogwarts' most dangerous textbook to life for young witches and wizards ages 9+. With this detailed building toy, kids build a brick-by-brick book that transforms into a furry, fanged menace that actually moves and chomps! Builders take on a wizard-worthy construction challenge as they recreate the book's distinctive furry cover, menacing eyes, and sharp teeth using LEGO bricks. The completed model features hidden wheels and an innovative pull-back function: place it on a flat surface, pull back, release, and watch as it races forward with its mouth chomping at anyone nearby! The set includes a Neville Longbottom minifigure with his own miniature Monster Book accessory, perfect for recreating scenes from the films. This unique Harry Potter collectible makes an excellent birthday gift for boys and girls who love model building sets and magical adventures. For even more fun, the LEGO Builder app provides intuitive building guidance with 3D model viewing and progress tracking. Contains 518 pieces.