Series in which Chris Packham delves deep beneath the skin to discover the unique features that have made certain animal groups successful. Concentrating on a single animal each week, Chris uses groundbreaking science and brand-new behaviour to shed new light on exactly what it is that has enabled these animals to thrive. Bats have colonised remote corners of the planet to become one of most widespread mammals on earth. Chris explores their incredible anatomy, physiology and senses to understand what enables them to thrive in some surprising places. Tiny hairs on their wings give them a detailed air-flow map during flight, heat sensors on the nose of vampire bats mean they can sense the most blood-rich areas of a prey's body, and iron oxide particles in the bat brain may act as a compass, allowing them to find the most direct route back to the roost.