Sandesh Kadur / Western hoolock gibbon (Hoolock hoolock) male hanging from branch, Assam, India.

Suzi Eszterhas / Indian rhinoceros (Rhinoceros unicornis) mother and calf (age 1-2 weeks) Kaziranga National Park, India.

Tony Heald / Junglefowl (Gallus gallus) male, Kaziranga National Park, Assam, India, March.

Tony Heald / Hanuman langur (Semnopithecus entellus) baby next to mother, Bandhavgarh National Park, India.

Tony Heald / Hanuman langur (Semnopithecus entellus) eating coconut husk, Bandhavgarh National Park, India. March.

Tony Heald / Indian rhinoceros (Rhinoceros unicornis) mother and calf, rear view. Kaziranga National Park, Assam, India. Vulnerable species

Tony Heald / Asian elephant (Elephas maximus) domesticated elephant working, picking reeds, Kaziranga National Park, Assam, India, March 2009.

Pete Oxford / Tea picker, collecting Tea leaves (Camelia sinensis) wearing large straw hat, Assam, North East India, October 2014.

Pete Oxford / Woman with basket on her head picking tea (Camellia sinensis), Assam, North East India, October 2014.

Denis-Huot / Indian rhinoceros (Rhinoceros unicornis), male, Kaziranga National Park, Assam, India

Thomas Marent / Indian Rhinoceros (Rhinoceros unicornis) crossing road near tourists, Kaziranga National Park, Assam, India

Thomas Marent / Golden Langur (Trachypithecus geei), Chakrashila Wildlife Sanctuary, Assam, India