Lucas Bustamante / Aerial view of cut tree trunks in deforested Ecuadorian Choco, Esmeraldas, Ecuador. 25 tree species, many of them threatened, are involved.

Daniel J. Cox / Gray Wolf (Canis lupus) predating female Elk (Cervus elaphus) crossing river, Alum Creek, Yellowstone National Park, Wyoming, sequence 4 of 4

Daniel J. Cox / Gray Wolf (Canis lupus) killing female Elk (Cervus elaphus) crossing river, Alum Creek, Yellowstone National Park, Wyoming, sequence 3 of 4

Daniel J. Cox / Gray Wolf (Canis lupus) attacking female Elk (Cervus elaphus) crossing river, Alum Creek, Yellowstone National Park, Wyoming, sequence 2 of 4

Daniel J. Cox / Gray Wolf (Canis lupus) pair predating female Elk (Cervus elaphus) crossing river, Alum Creek, Yellowstone National Park, Wyoming, sequence 1 of 4

Daniel J. Cox / Gray Wolf (Canis lupus) pack on ridge in winter, Lamar Valley, Yellowstone National Park, Wyoming

John Cancalosi / Group of gravid female Timber rattlesnakes (Crotalus horridus) basking before giving birth, Pennsylvania, USA, July.

John Cancalosi / Female Timber rattlesnake (Crotalus horridus) at nest site with newborn young, Pennsylvania, USA, September.

Philippe Clement / Woodpiles amongst flowering Bluebells (Hyacinthoides non-scripta) in beech woodland, Hallerbos / Halle forest, Belgium, April.

Steve O. Taylor (GHF) / Cut trees in the Waka forest, Gabon, Central Africa, 2008-2009.

Jabruson / African rainforest clearance - men sawing hardwood tree trunks to make planks. South of Mbomo, Odzala-Kokoua National Park, Republic of Congo, May 2005.

Jabruson / African rainforest clearance, men sawing hardwood tree trunks to make planks. South of Mbomo, Odzala-Kokoua National Park, Republic of Congo, May 2005.