Andy Rouse / Dalmatian pelican (Pelecanus crispus) landing on lake, backlit by sunlight, Lake Kerkini, Greece.

Andy Sands / Slime mould (Stemonitis sp.) newly emerged bright yellow sporangia on rotting log, Buckinghamshire, England, UK. September. Focus stacked.

Andy Sands / Wrinkled peach fungus (Rhodotus palmatus), young fungus growing from Elm log showing characteristic guttation, Hertfordshire, England, UK. November. Focus stacked.

Andy Sands / Holly parachute fungus (Marasmius hudsonii) young 2mm tall fungus after rain, with water droplets caught among hairs, Buckinghamshire, England, UK. November. Focus stacked.

Andy Rouse / Dalmatian pelican (Pelecanus crispus) landing on lake, backlit by sunlight, Lake Kerkini, Greece.

Andy Rouse / Dalmatian pelican (Pelecanus crispus) landing on lake, backlit by sunlight, Lake Kerkini, Greece.

Alex Mustard / A diver swimming through the Silfra fissure, a crack in the Earth's crust between the North American and Eurasian continental plates, which is filled with glacial melt water. In this photo the Am...

David Perpinan / Flathead grey mullet (Mugil cephalus) and Salema (Sarpa salpa) school swimming past the camera in the mouth of the Besos river. The fish enter and leave frame. Barcelona, Spain. October.

David Perpinan / Catalan chubs (Squalius laietanus) swimming around, showing interest in the camera. The fish enter and leave frame. Besos river, Barcelona, Spain. October.

David Perpinan / Catalan chubs (Squalius laietanus) enter frame, swim around and then leave frame. Besos river, Barcelona, Spain. October.

David Perpinan / Catalan chub (Squalius laietanus) shoal swimming around close to the riverbed. The fish enter and leave frame. Besos river, Barcelona, Spain. October.

David Perpinan / Common carps (Cyprinus carpio) swimming. The fish enter and leave the frame. Besos river, Barcelona, Spain. July.