Kerstin Hinze / Two Black-bellied hamsters (Cricetus cricetus) fighting, Vienna, Austria, October.

Guy Edwardes / River Braan at Black Linn Falls, The Hermitage, Dunkeld, Perthshire, Scotland, UK. October, 2013.

Guy Edwardes / Svartifoss / Black Falls, Skaftafell National Park Iceland, July 2009

Wild Wonders of Europe / della Ferrera / Black maidenhair fern (Adiantum capillus veneris) with water falling past, near Kravice falls, Trebizat River, Bosnia and Herzegovina, May 2009

Shane P. White / Brown Capuchin (Cebus apella), Iguacu Falls, Argentina

Ingo Arndt / Black-fronted Piping Guan (Pipile jacutinga) feeding on moss at upper edge of waterfall, Iguazu Falls, Iguazu National Park, Argentina January 2014.

Ingo Arndt / Black-fronted Piping Guan (Pipile jacutinga) feeding on moss at upper edge of waterfall, Iguazu Falls, Iguazu National Park, Argentina, January 2014.

Ingo Arndt / Black-fronted Piping Guan (Pipile jacutinga) feeding on moss at upper edge of waterfall, Iguazu Falls, Iguazu National Park, Argentina, January 2014.

Javier Aznar / Glass frog (Centrolenidae) tadpoles dropping off leaf, Mindo, Ecuador

John Cancalosi / Palygorskite or attapulgite, a magnesium aluminium phyllosilicate, Medlin falls, Washington, USA.

Roy Mangersnes / Glacier calving causing kittiwakes (Rissa tridactyla) to take to the air in panic, west coast of Svalbard, Norway, August.

Ian McCarthy / Atlantic salmon (Salmo salar) leaping up Cassley Falls, Scotland, UK

Ian McCarthy / Atlantic salmon (Salmo salar) leaping up Cassley Falls, Scotland, UK

Angelo Gandolfi / Black vultures (Coragyps atratus) in flight over Iguazu falls, Brazil/Argentina, from the Brazilian side. September 2010.

Angelo Gandolfi / Black vultures (Coragyps atratus) in flight over Iguazu falls, Brazil/Argentina, from the Brazilian side. September 2010.

Angelo Gandolfi / Black vulture (Coragyps atratus) in flight in front of Salto Mosqueteros waterfall, Iguazu falls, Brazil/Argentina, from the Brazilian side. September 2010.

Angelo Gandolfi / Black vultures (Coragyps atratus) in flight in front of Salto Santa Maria waterfall, Garganta del Diablo (Devil's Throat), Iguazu falls, Brazil/Argentina. September 2010.

Kirkendall-Spring / Big Creek Falls in the Lewis River Valley, Giford Pinchot National Forest, Washington, USA.

Kirkendall-Spring / Black and white photograph of the Middel North Falls in Silver Falls State Park, Oregon, USA.

Ingo Arndt / Black-fronted Piping Guan (Pipile jacutinga) feeding on moss at upper edge of waterfall, Iguacu Falls, Iguacu National Park, Argentina

Nick Garbutt / Aggregation / flocks of Black Vultures (Coragyps atratus) circling on morning thermals forming over Iguasu Falls, on the Iguasu River, Brazil / Argentina border. Photographed from the Brazilian side o...

Cyril Ruoso / Risco Waterfall flowing over basalt, Rabacal, Madeira

Cyril Ruoso / Risco Waterfall flowing over basalt, Rabacal, Madeira

Gavin Hellier / Svartifoss waterfall which is flanked by over hanging black basalt columns hence the name Svartifoss or Black Falls, Skaftafell National Park, Southern Vatnajokull, Iceland 2006

Adrian Davies / Seed of a Sycamore (Acer pseudoplatanus) tree falling in autumn. Long exposure

Ben Hall / 2020VISION / Monochrome image of waterfall breaking on rocks at the base of Lodore Falls, Lake District NP, Cumbria, England, UK, November

John Abbott / Male and female Dobsonfly (Corydalus sp) in flight (male on right), Dolan Falls Preserve, Texas, USA, September

Graham Eaton / A pair of Black Kite (Milvus migrans) fighting in flight over a frog. Murchison Falls National Park, Uganda, April.

Guy Edwardes / Svartifoss / Black Falls, Skaftafell National Park Iceland, July 2009

Jack Dykinga / Yosemite Falls amid low clouds with California Black Oaks (Quercus kelloggi) covered in snow in foreground, Yosemite National Park, California

Tim Fitzharris / Cascades tumbling 110 feet at Emerald Pools, note the black streaks called desert varnish, Zion National Park, Utah

Tim Fitzharris / Cascades tumbling 110 feet at Emerald Pools, note the black streaks called desert varnish, Zion National Park, Utah

Tim Fitzharris / Cascades tumbling 110 feet at Emerald Pools, note the black streaks called desert varnish, Zion National Park, Utah

Tim Edwards / Black Falls (Y Rhaeadr Ddu) in October. Snowdonia NP, Wales, UK, Europe

Shane P. White / Brown Capuchin (Cebus apella) scratching itself, Iguacu Falls, Argentina

Cyril Ruoso / Risco Waterfall flowing over basalt, Rabacal, Madeira

Roberto Rinaldi / Tamarind falls, Black River, Mauritius.

Roberto Rinaldi / Tamarind falls, Black River, Mauritius.

Roberto Rinaldi / Tamarind Falls, Black River, Mauritius.

Roberto Rinaldi / Tamarind falls, Black River, Mauritius.

Roberto Rinaldi / Tamarind falls, Black River, Mauritius.

Tim Fitzharris / Cascades tumbling 110 feet at Emerald Pools, note the black streaks called desert varnish, Zion National Park, Utah

John Waters / Two falling white feathers on black background, Bristol, UK. Digital composite.

John Waters / Falling white feather on black background, Bristol, UK. Digital composite.

John Waters / Salsify seeds (Tragopogon porrifolius) falling on black background, Bristol, UK.

Adrian Davies / Dipterocarp seed (Shorea sp.) spiralling downwards. Controlled flash + LED lighting.

Roland Seitre / Mule deer (Odocoileus hemionus) female herd grazing close to buildings, Klamath Falls, Oregon, USA. February.

Roland Seitre / Two Crab-eating macaques (Macaca fascicularis) sitting on rubbish bin eating discarded food, Alexandra Falls, Black River Gorges National Park, Mauritius.

Roland Seitre / Mauritius olive white-eye (Zosterops chloronothos) perched on branch, Alexandra Falls, Black River Gorges National Park, Mauritius. Critically endangered.

Roland Seitre / Mauritius grey white-eye (Zosterops mauritianus) perched in tree, Alexandra Falls, Black River Gorges National Park, Mauritius.

Stephen Dalton / Falling autumn leaf against black background.

Adrian Davies / Dipterocarp seed spiralling down to the ground, on black background.

Bruce Thomson / Plush-crested jay (Cyanocorax chrysops) perching on branch, Iguazu Falls, Argentina.

NaturePL Showreels / Happy Valentines Day - our gift to you, our 'Top 10 Tips for Finding Love (after a global pandemic)'.

Frederique Olivier / African penguin (Spheniscus demersus) in moult stumbling as it walks over rocks to join colony, Betty's Bay nature Reserve, South Africa, December.

David Perpinan / Two Great cormorants (Phalacrocorax carbo) drying their wings, another tries to join but falls down the dam, Barcelona, Spain, November.