1. Gentoo penguins and sea lion, Falkland Islands. Photo courtesy of BBC
2. Emperor penguin chicks, Antarctica
3. Chinstrap penguins, Antarctic peninsula
4. Adélie penguins, close to the Antarctic Circle
8. Emperors and equipment heap, Antarctica (photo: Chadden Hunter)
9. Waterfalls, Nordaustlandet, Svalbard
10. Bear swimming, Nordaustlandet, Svalbard (photo: Jason Roberts)
11. Wolf hunt, Yellowstone National Park, USA
12. Shearwaters, Aleutian Islands, Alaska
13. Tiger, Bandhavgarh National Park, India (photo: Mike Gunton/John Aitchison)
14. Tiger tourism, Bandhavgarh National Park, India (photo: Emily Winks/John Aitchison)
16. Polar bear family, Svalbard (photo: Jason Roberts)
17. Male polar bear, Svalbard (photo: Jason Roberts)
18. Lynx, Yukon Territory, Canada (photo: Adam Chapman)
19. Crane feather, Poyang Lake, China
20. Improvised metal hide (metal fort), Bird Island, South Atlantic (photo: Miles Barton)
21. The pier in seal season, Bird Island, South Atlantic (photo: Miles Barton)
22. Wandering albatross courting display, Bird Island, South Atlantic
23. Peregrine falcon, New York, USA (photo: Paul Thompson)
24. Booby on camera, French Frigate Shoals, Pacific Ocean
25. Otters, Argyll, Scotland (photo: Rowan Aitchison)
All photographs author’s own unless otherwise stated.