David Tipling / Men of Mendi from the Southern Highlands at Hagen Show, Western Highlands, Papua New Guinea. Head dress has King of Saxony plumes and breast shield of Superb Bird of Paradise plus plumes from Blue bir...

Claudio Contreras / Macaya breast-spot landfrog (Eleutherodactylus thorectes), critically endangered, Pic Macaya National Park, Massif de la Hotte, Haiti, October

Alan Williams / Male Ruddy Duck (Oxyura jamaicensis) displaying on lake expelling air from breast feathers to form bubbles (captive bird) UK, May 2010

Ross Hoddinott / Robin (Erithacus rubecula) resting on trowel handle in a garden, Nr Bradworthy, Devon, England, UK. January

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) adult female nursing her two yearling cubs on sedge flats, Katmai National Park, Alaska

John Shaw / Ruddy duck (Oxyura jamaicensis) in a small marsh pond, doing courtship display where it beats its breast with bill to create bubbles. British Columbia, Canada. June.

Marie Read / Clark's grebes (Aechmophorus clarkii) courting pair performing the 'Weed Ceremony' in which they slowly circle breast to breast holding pond weed as nesting material, Lake Hodges, Escondid...

Karine Aigner / Biologist blowing on the breast of a Hermit thrush (Catharus guttatus) in order to separate feathers to see how much fat the bird has gained. Fat gain is important for migratory birds as they use a lo...

Ashley Cooper / Robin (Erithacus rubecula) at RSPB Leighton Moss Bird Reserve, Silverdale, Lancashire, England, UK. February 2016

Ashley Cooper / Robin (Erithacus rubecula) at RSPB Leighton Moss Bird Reserve, Silverdale, Lancashire, England, UK. February 2016

Graham Eaton / Crenulation cleavage developed in Pre-Cambrian age, metamorphic, Chlorite Schist. Llyn, Wales, UK, May

Graham Eaton / Crenulation cleavage developed in Pre-Cambrian age chlorite schist, a metamorphic rock Llyn, Wales, UK, May