Book excerpt: Although they are deceptively stark, the world's Polar Regions support a surprisingly diverse range of wildlife. Life Cycles: Polar Lands by Sean Callery explores how ten of these creatures from both poles—including the arctic fox, the polar bear, the ringed seal, and the arctic tern—are all interrelated in three polar food chains. Along with a clear explanation of each lifecycle, the book highlights three key facts about each animal, and color-codes the food-chains for easy navigation. The beautiful photography, accessible design, and age appropriate writing make this the perfect introduction to understanding the delicate balance of this extreme and environmentally sensitive habitat.