Whales are the only mammals that spend their entire life in the water. From playful dolphins to enormous blue whales, the behavior, habitats, and physiology of these amazing marine mammals are explored in What is a Whale? Spectacular full-color photos help show: flukes, flippers, and fins the whale family tree baleen and toothed whales how whales communicate through echolocation watery homes and what they eat baby whales whale-watching and why whales are in danger
Some Archaea thrive in extreme places such as in thermal pools, hot vents at the bottom of the sea, extremely salty water, and even in underground oil reserves. This book examines the diverse Archaea kingdom and the division of these organisms by their unusual biology into three main groups. It also explains why little in general is known about them, and why further classification of Archaea is so difficult.