Joel Sartore has traveled all over the world taking pictures of endangered species in their natural habitats. But in 2005, his wife was diagnosed with cancer, and Sartore stepped away from working in the field to care for her and their three kids. While at home, Sartore decided to take simple, intimate portraits of vulnerable animals in a studio. He hopes the images will give people a new perspective on what we could lose if the animals go extinct.