MAMMALS

Appaloosa via Wikimedia Commons [CC BY-SA 3.0]

"Mammals are a class of vertebrates characterised by warm-blood, hairy bodies, a four-chambered heart, a single jaw bone, sweat glands and - in females - mammary glands for suckling young." - BBC

“Mammals Videos, News and Facts.” BBC Nature, BBC, www.bbc.co.uk/nature/life/Mammal.