Who were the first animals on Earth? What differentiates a reptile from an amphibian? How do mammals give birth? What do insects eat? This encyclopedia will answer these and more hows and whats for you. Learning is made simpler with well-labelled diagrams and an extensive glossary of difficult words. Bonus: the engrossing book comes loaded with Isn' t It Amazing— a section of fun facts to keep you glued for more. This encyclopedia is a must-read for all children!