Klein & Hubert / African red-eyed bulbul (Pycnonotus nigricans) jumping while bathing at water hole Kalahari Desert, South Africa.

Alex Mustard / Black hamlet (Hypoplectrus nigricans) and Yellowbelly hamlet (Hypoplectrus aberrans) spawning at dusk. As this genus is quite recently evolved hybridization is still possible. Hamlets are one of the...

Brandon Cole / Pacific blue marlin {Makaira nigricans mazara} Hawaii Pacific Ocean

Richard Herrmann / Yellowfin Tuna (Thunnus albacares) and Blue Marlin (Makaira nigricans) beside floating kelp, Nine Mile Bank, San Diego, California

Suzi Eszterhas / Water monitor (Varanus salvator) resting on tree trunk in forest. Kinabatangan River, Borneo, Malaysia.

Suzi Eszterhas / Water monitor (Varanus salvator) in tree. Kinabatangan River, Borneo, Malaysia.

Philippe Clement / Austrian pine / black pines (Pinus nigra subsp. nigra) coniferous evergreen tree in park, native to Austria. May

Heather Angel / Black coral vine (Kennedia nigricans) flowers, pollinated by honeyeaters (flowers triggered by honeyeater, releasing the stamens, style and stigma), Western Australia Sequence 2 of 2

Heather Angel / Black coral vine (Kennedia nigricans) flowers, pollinated by honeyeaters (showing untriggered flowers), Western Australia Sequence 1 of 2

Nigel Cattlin / Asian water monitor (Varanus salvator) basking on rock, on bank of River Kwai, Kanchanaburi, Thailand.

Sergio Hanquet / Atlantic blue marlin (Makaira nigricans). Tenerife, Canary Islands.

Duncan Murrell / Asian water monitor (Varanus salvator) near the LAHG Research Station in the Sabangau (peat-swamp) Forest, Central Kalimantan, Indonesia.

Magnus Lundgren / Wild Wonders of China / Sacoglossan sea slug (Cyerce nigricans) Xiaoliuqiu Island, Taiwan

Magnus Lundgren / Wild Wonders of China / Sacoglossan sea slug (Cyerce nigricans) Xiaoliuqiu Island, Taiwan

Magnus Lundgren / Wild Wonders of China / RF - Sacoglossan sea slug (Cyerce nigricans) Xiaoliuqiu Island, Taiwan

Bruno D'Amicis / Autumn colors in the Camosciara mountains where Black pine (Pinus nigra) forest meets Cacciagrande old-growth Beech (Fagus sylvatica) forest. Abruzzo, Lazio and Molise National Park / Parco Nazionale...

Mike Read / Corsican pine (Pinus nigra laricio) with peaks of Aiguilles de Bavella in background. Col de Bavella, Corsica, France. July 2018

Mike Read / Restonica River and Restonica Valley with Corsican pine (Pinus nigra laricio). Regional Natural Park of Corsica, France. July 2018

Mike Read / Ruisseau de Verjello River and surrounding Corsican pine (Pinus nigra laricio) forest. Foret de Cervello, Vivario, Haute-Corse, Corsica, France. May 2017.

Klein & Hubert / African red-eyed bulbul (Pycnonotus nigricans) drinking at waterhole, Kalahari, South Africa.

Klein & Hubert / African red-eyed bulbul (Pycnonotus nigricans) bathing at waterhole. Kalahari Desert, South Africa

Klein & Hubert / African red-eyed bulbul (Pycnonotus nigricans) bathing at waterhole. Kalahari Desert, South Africa

Klein & Hubert / African red-eyed bulbul (Pycnonotus nigricans) bathing at waterhole. Kalahari Desert, South Africa

Klein & Hubert / Pyreneean pine (Pinus nigra salzmannii) Alberes mountain range,Pyrenees, France.

Klein & Hubert / Pyreneean pine (Pinus nigra salzmannii) Alberes mountain range,Pyrenees, France.

Klein & Hubert / Pyreneean pine (Pinus nigra salzmannii) Alberes mountain range,Pyrenees, France.

Klein & Hubert / Pyreneean pine (Pinus nigra salzmannii) Alberes mountain range,Pyrenees, France.

Axel Gomille / Water monitor (Varanus salvator), swimming and flicking tongue, Thailand

Nick Garbutt / Marojejy Green and Brown Mantella Frog (Mantella nigricans) in leaf litter in lowland rainforest. Marojejy National Park, north east Madagascar.

Nick Garbutt / Marojejy Green and Brown Mantella Frog (Mantella nigricans) in leaf litter in lowland rainforest. Marojejy National Park, north east Madagascar.

Nick Garbutt / RF - Marojejy Green and Brown Mantella Frog (Mantella nigricans) in leaf litter in lowland rainforest. Marojejy National Park, north east Madagascar. (This image may be licensed either as rights manag...

Angelo Gandolfi / Resin extraction from Austrian Pine (Pinus nigra calabrica) June, Sila National Park, Calabria, Italy.

Angelo Gandolfi / Resin extraction from Austrian Pine (Pinus nigra calabrica) Sila National Park, Calabria, Italy. June.

Angelo Gandolfi / Austrian pine (Pinus nigra calabrica) trees with cones on the ground, Sila National Park, Calabria, Italy, June.

Angelo Gandolfi / Austrian pine (Pinus nigra calabrica) Sila National Park, Calabria, Italy. June.

Angelo Gandolfi / Austrian pine (Pinus nigra calabrica) forest. Sila National Park, Calabria, Italy.

Angelo Gandolfi / Austrian pine (Pinus nigra calabrica) Sila National Park, Calabria, Italy. June.

Angelo Gandolfi / Austrian pine trees (Pinus nigra calabrica) Sila National Park, Calabria, Italy. June.

Angelo Gandolfi / Giant Austrian pine (Pinus nigra calabrica) tree trunks, Fallistro, Sila National Park, Calabria, Italy, June.

Alan Williams / Beetle (Cantharis nigricans) resting on leaf at edge of meadow, Cheshire, UK, May.

Richard Du Toit / Dusky lark (Pinarocorys nigricans) Kruger National Park, South Africa.

David Kjaer / Black rustic moth (Aporophyla nigra) profile, Wiltshire, UK

Nick Upton / Black pine / Austrian pine (Pinus nigra) growing from limestone outcrop in Sutjeska National Park, Bosnia and Herzegovina, July 2014.

Nick Upton / Young Black pine / Austrian pine (Pinus nigra) growing in alpine meadows in Sutjeska National Park, with the Zelengora mountain range, background, Bosnia and Herzegovina, July 2014.

Roland Seitre / Philippine mouse-deer (Tragulus nigricans) 'tapetum lucidum' in eyes shining with reflected light, captive endemic to Balabac, Philippines.

Alex Mustard / Black hamlets (Hypoplectrus nigricans) spawning, backlit to make the eggs visible. Oro Verde Wreck, Grand Cayman, Cayman Islands. Caribbean Sea, January.

Juan Manuel Borrero / European black pine tree (Pinus nigra) growing on cliffs, Pradell-La Argentera Mountain Range Area of Natural Interest, Tarragona, Catalonia, Spain, May 2013.

Cyril Ruoso / European black pine (Pinus nigra) forest floor with Sword-leaved helleborine (Cephalanthera longifolia) with sun shining through the tree trunks, Cevennes, France.