Stack-a-Roos STEM Toy for Toddlers. A sturdy 5 Piece stacking animal tower with lights and sound. We've brought the zoo to your child's bedroom with our precious baby animal Stack-a-Roo. This stacking toy will encourage kids to stack, build and learn. Watch as your baby girl or boy uses their critical thinking skills to arrange the stacking puzzle. Once your toddler stacks the animal tower correctly, lights and trumpet sounds will emit from the base. The lights and audio sounds are a reward system and act as positive reinforcement for a job well done. The more your child plays, they will learn to recognize patterns and develop their fine motor skills, fostering counting skills. Stack-a-Roos pals are durable early learning toys that were built to last. Stack-a-Roos toys are BPA and Phthalate-free and fully safety tested. The musical toys were built to last and will keep your child entertained for hours. Stimulates fine motor skills and sensory development in boys and girls ages 12 months and up.