biology

Teeth are amazing – the product of half a billion years of evolution. They provide fuel for the body by breaking apart other living things; and they must do it again and again over a lifetime without themselves being broken in the process. This means that plants and animals have developed tough or hard tissues for protection, and teeth have evolved ways to sharpen or strengthen themselves to overcome those defences. And just as different jobs require different tools, animals with different diets have different shaped teeth to deal with the variety of foods that they eat. In this Very Short Introduction, Peter S. Ungar, an award-winning author and leading scientist, presents the story of teeth. Ungar outlines the key concepts, including insights into the origin of teeth and their evolution. Considering why teeth are important, he describes how they are made, and how they work, including their fundamental importance in the fossil record. Ungar finishes with a review of mammal teeth, looking at how they evolved and how recent changes to our diet are now affecting dental health.

Apes and dolphins: primates and cetaceans. Could any animals appear to be more different? Yet both are large-brained intelligent mammals with complex communication and social interaction. In the first book to study apes and dolphins side by side, Maddalena Bearzi and Craig B. Stanford, a dolphin biologist and a primatologist who have spent their careers studying these animals in the wild, combine their insights with compelling results. This book explains how and why apes and dolphins are so distantly related yet so cognitively alike and what this teaches us about another large-brained mammal: Homo sapiens. Noting that apes and dolphins have had no common ancestor in nearly 100 million years, Bearzi and Stanford describe the parallel evolution that gave rise to their intelligence. And they closely observe that intelligence in action, in the territorial grassland and rainforest communities of chimpanzees and other apes, and in groups of dolphins moving freely through open coastal waters. The authors detail their subjects’ ability to develop family bonds, form alliances, and care for their young. They offer an understanding of their culture, politics, social structure, personality, and capacity for emotion. The resulting dual portrait – with striking overlaps in behaviour – is key to understanding the nature of “beautiful minds.”