Guy Edwardes / Young Grey Seal {Halichoerus grypus} taking a break from suckling from mother, Donna Nook, Lincolnshire, England, January

Yukihiro Fukuda / Japanese macaque / Snow monkey {Macaca fuscata} four-day-old newborn baby reaches up for mother's nipple, Jigokudani, Nagano, Japan

Eric Baccega / Chimpanzee (Pan troglodytes) female aged 41 years, portrait. Beauval Zoo Parc, France. Captive.

Fiona Rogers / Bonnet macaque (Macaca radiata) female portrait . Hampi, Karnataka, India.

Nick Upton / Eurasian beaver (Castor fiber) female grooming on the margins of the River Otter, Devon, UK, July. Part of Devon Wildlife Trust's Devon Beaver Trial.

Roland Seitre / Wild boar (Sus scrofa) two females walking side by side, Central Cape York, Oriners, Queensland, Australia. Introduced species

Anup Shah / Dusky leaf monkey (Trachypithecus obscurus) female portrait . Khao Sam Roi Yot National Park, Thailand.

Cyril Ruoso / Bonobo (Pan paniscus) mother holding newborn baby, Lola Ya Bonobo Sanctuary. Democratic Republic of the Congo. Non-ex

Edwin Giesbers / Barbary ground squirrel (Atlantoxerus getulus) female on side of palm line road, Fuerteventura, Canary Islands. Introduced from North Africa.

Edwin Giesbers / Barbary ground squirrel (Atlantoxerus getulus) female, Fuerteventura, Canary Islands. Introduced from North Africa.

Edwin Giesbers / Barbary ground squirrel (Atlantoxerus getulus) female, Fuerteventura, Canary Islands. Introduced from North Africa.

Roland Seitre / Red kangaroo (Macropus rufus) tiny baby suckling in pouch, Mount Isa, Queensland, Australia. Captive.