Born into an aristocratic British family, he turned his empathy and knowledge of the world’s largest land mammals to the cause of saving them from poachers.

A global treaty has extended trade protections to more than 70 shark and ray species whose numbers are in sharp decline.

© Matthew Abbott for The New York Times

Thousands of the endangered primates end up on the dinner plates of people in the upper rung of the country’s society who have money to spare.

© Cortni Borgerson