The most difficult photographs in nature

Outside magazine recently asked a handful of nature photographers to discuss the most difficult shots they ever captured. Philipp Engelhorn selected a photograph taken on the frozen tundra of China:

Winters in northern Xinjiang, China, rival those in Siberia: Forty below zero is normal. We’d gone in the fall to find an eagle hunter and make a handshake deal to follow him. But when we actually showed up two months later, he told us he never expected us to return and had no time for us. So we did the worst thing ever and set out by horse-drawn sleigh across the frozen countryside to find an eagle hunter.

The images that accompany the article are incredible and make most day jobs look like an all-day pancake buffet.

• nature
• photography