This story appears in the May 2012 issue of National Geographic magazine. It’s two in the morning and a koala is caught in barbed wire on a fence, like a prisoner trying to escape. A phone rings ...

Q: How—and why—did you take this photograph? A: I knew I had to get a picture of dead koalas for this story, but I kept running into trouble. People at the animal clinic I was working with ...

Once more teaming with National Geographic (as they did on "Free Solo ... the cave and monsoon-like rains were on the horizon, the rescue became a race against time. But it so happened that ...