Jean E. Roche / Cory's shearwater (Calonectris diomedea) juvenile with dark fluff collar on the head, handled by scientist during bird ringing. Frioul archipelago, Marseille, France.

Paul Hobson / Linnet (Carduelis cannabina) female with nesting fluff, material, Sheffield, England, UK, April.

Jane Burton / Smudge-nose Persian x Birman kitten, Fluff, among flowers.

Andrew Parkinson / Gannet (Morus bassanus) growing chick stretches its wings a small peice of fluff is dislodged from its head. Shetland Islands, Scotland, UK, August.

Philippe Clement / Grass covered in seed fluff from female willow (Salix sp.) tree catkins, dispersed by the wind. Belgium, May.

Nature Production / Japanese Horsechestnut (Aesculus turbinata) winter sticky bud covered in fluff of Japanese silver grass, Japan

Juan Carlos Munoz / Looking up through the branches of White poplar tree (Populus alba) with seeds covered in thick white fluff to aid wind dispersal, Andalucia, Spain, March

Juan Carlos Munoz / White poplar tree (Populus alba) with seeds covered in thick white fluff to aid wind dispersal, Andalucia, Spain, March

Juan Carlos Munoz / White poplar tree (Populus alba) with seeds covered in thick white fluff to aid wind dispersal, Andalucia, Spain, March

Juan Carlos Munoz / Branches of White poplar tree (Populus alba) with seeds covered in thick white fluff to aid wind dispersal, Andalucia, Spain, March

Charlie Summers / Great horned owl (Bubo virginianus) two chicks looking out of nest cavity in tree. Chicks are just over four weeks old and starting to lose their white fluff, Eastern Arapahoe County, Colorado, USA.