What makes us mammals
We share something in common with giant Blue Whales, tiny shrews and more than 5 thousand other species on earth. We are mammals. Former neurobiologist and freelance writer Liam Drew thinks of himself as a mammal first and human second. He explores the evolution of the things that we share with other mammals, like sophisticated teeth, lactation and elaborate reproduction system in his book, I Mammal: The Story of What Make Us Mammals