Book excerpt: How do flies eat? How do crickets make sound? Why are penguins' wings so good for swimming? In this diverse collection of twenty-four crazy, kooky, and quirky biology experiments, young scientists will learn the answers to these questions. They will perform fun, hands-on experiments that enlighten them on all kinds of creatures in the animal kingdom. Students will also gain insight into the basic biological component of the cell, learn how temperature affects smells, and even connect with their own heartbeats in this lively installment from Janice VanCleave featuring color illustrations and safe, simple step-by-step instructions.