David Fleetham / Smooth trunkfish (Lactophrys triqueter), portrait. Bonaire, Dutch Caribbean.

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

Marie Read / Northern cardinal (Cardinalis cardinalis) male (right) feeding his mate in spring as part of courtship/pair formation, termed "allofeeding", New York, USA, May.

Marie Read / Northern cardinal (Cardinalis cardinalis) male (right) feeding his mate in spring as part of courtship/pair formation, termed "allofeeding", New York, USA, May.

Marie Read / Northern cardinal (Cardinalis cardinalis) male (right) feeding his mate in spring as part of courtship/pair formation, termed "allofeeding", New York, USA, May.

Roland Seitre / Buff headed capuchin (Sapajus xanthosternos) two interacting, captive, endemic to Bahia State, Brazil.

Kristel Richard / Eagle hunter woman whipping man on slow Mongolian horse to try to slow him down during game at the Eagle hunter's festival. She is on a faster horse but if he wins the game he is entitled to a kiss....