Ernie Janes / Domestic pig, free range sow and piglet sniffing noses, UK, August 2010

Jane Burton / Portrait of young blonde haired girl, lying down with with two Golden Retriever puppies. Model released

Staffan Widstrand / Two Cheetahs (Acinonyx jubatus) touching noses in greeting display, Serengeti NP, Tanzania, East Africa, January

Shin Yoshino / Black-tailed Prairie Dog (Cynomys ludovicianus) pair touching noses for identification, Colorado

Jim Brandenburg / Black-tailed Prairie Dog (Cynomys ludovicianus) pair nuzzling to communicate, South Dakota

Karl Ammann / Young Chimpanzees 'kissing' {Pan troglodytes} Chimfunshi sanctuary, Zambia

Mark Carwardine / Tourist in small boat leaning out to kiss a Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, February 2009

Roland Seitre / Spix's Macaw (Cyanopsitta spixii) male and female pair touching beaks, captive, critically endangered species, from Brazil

John Cancalosi / Two Blacktail Prairie Dogs (Cynomys ludovicianus) one adult, and a juvenile, engaging in a greeting 'kiss' Wyoming, USA

Jane Burton / Portrait of young blonde haired girl playing with West Highland White Terrier puppy. Model released

Jane Burton / Portrait of young blonde haired girl, lying down and playing with with two Golden Retriever puppies. Model released

Tim Laman / Huntsman spider (Sparassidae) resting on paperback books including "Kiss of the Spider Woman" on a shelf at the rainforest reseearch station in Gunung Palung National Park, Borneo, West Kalimantan, In...