Jenny E. Ross / Polar Bear (Ursus maritimus) sub-adult male on cliff searching for eggs in Brunnich's Guillemot nests, as gulls look on from above. This unusual behaviour happens when when lack of sea-ice prevents t...

Andy Rouse / 2020VISION / Wild boar (Sus scrofa) female in woodland undergrowth smelling air for scent of human, Forest of Dean, Gloucestershire, UK, March. Photographer quote: 'I am not sure if it was my lack of smelly shower...

Georgette Douwma / A rescued battery hen. They often lack feathers when they come out of the battery barns. UK.

Georgette Douwma / Rescued battery hens with rooster. The chickens often lack feathers when they come out of the battery barns. UK.

Stephen Dalton / Garden spider {Araneus diadematus} constructing its orb web, UK, Sequence 5/5 , The final web is complete. Note that although all the final sticky spirals are visible, most of the radials are invisibl...

Solvin Zankl / Seeds of Oxeye daisy (Chrysanthemum leucanthemum), Europe. Dispersal is coincidental by wind, animals or water. The seeds lack any obvious structures for specialised dispersal.

Rod Williams / Lac Alaotra bamboo lemur juvenile {Hapalemur griseus alaotrensis} Madagascar Lack

Phil Savoie / Early bumblebee (Bombus pratorum), newly emerged male with characteristic yellow collar and lack of stinger. Standing on human finger, Monmouthshire, Wales, UK. May.

Phil Savoie / Early bumblebee (Bombus pratorum), newly emerged male with characteristic yellow collar and lack of stinger. Standing on human finger, Monmouthshire, Wales, UK. May.

Phil Savoie / Early bumblebee (Bombus pratorum), newly emerged male with characteristic yellow collar and lack of stinger. Standing on human finger, Monmouthshire, Wales, UK. May.

Fabrice Cahez / Lack-winged Stilt (Himantopus himantopus) Aude, France, July.

Fabrice Cahez / Lack-winged Stilt (Himantopus himantopus) Aude, France, July.