Claudio Contreras / Grey whale (Eschrichtius robustus) breaching, San Ignacio Lagoon, El Vizcaino Biosphere Reserve, Baja California, Mexico, March

Claudio Contreras / Grey whale (Eschrichtius robustus) tail, San Ignacio Lagoon, El Vizcaino Biosphere Reserve, Baja California, Mexico, March

Claudio Contreras / Grey whale (Eschrichtius robustus) calf, San Ignacio Lagoon, El Vizcaino Biosphere Reserve, Baja California, Mexico, February

Mark Carwardine / Grey whale (Eschrichtius robustus) at water surface with mouth open showing baleen plates, San Ignacio Lagoon, Baja California, Mexico

Alex Mustard / Grey seal (Halichoerus grypus) young seal silhouetted against the sun as it dives after breathing, Lundy Island, Devon, UK, Bristol Channel, August

Tony Wu / Grey whale (Eschrichtius robustus) calf at ocean surface, with its mother visible, Magdalena Bay, Baja California, Mexico.

Anup Shah / Southern plains grey langur / Hanuman langurs (Semnopithecus dussumieri) playing on the cliff tops at sunrise . Jodhpur, Rajasthan, India. March.

Anup Shah / Southern plains grey langur / Hanuman langur (Semnopithecus dussumieri) juvenile approaching with curiosity. Jodhpur, Rajasthan, India. March.

Anup Shah / Southern plains grey langur / Hanuman langur (Semnopithecus dussumieri) juvenile playing silhouetted at sunrise, Jodhpur, Rajasthan, India. March.

Anup Shah / Southern plains grey langur / Hanuman langur (Semnopithecus dussumieri) juveniles playing at sunrise, Jodhpur, Rajasthan, India. March.

Nick Upton / Rescued Grey seal pup (Halichoerus grypus) in a convalescence pool where it will be kept until strong enough to be released back to the sea, Cornish Seal Sanctuary, Gweek, Cornwall, UK, January.

Cyril Ruoso / Close up of Sumatran rhinoceros (Dicerorhinus sumatrensis) female feeding, part of a breeding program, Way Kambas National Park, Sumatra, Indonesia.