Alex Mustard / Yellowbelly hamlets (Hypoplectrus aberrans) pair spawning at dusk (artifically backlit). Hamlets are hermaphroditic species. George Town, Grand Cayman, Cayman Islands. Caribbean Sea.

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...

Alex Mustard / Butter hamlet (Hypoplectrus unicolor) pair spawning at dusk, George Town, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Pair of Yellowbelly hamlets (Hypoplectrus aberrans) spawning at dusk. Hamlets are one of the few vertebrate species that are true hermaphrodites, here the fish with the open mouth is acting as a male...

Alex Mustard / Pair of Barred hamlets (Hypoplectrus puella) spawning at dusk . Hamlets are one of the few vertebrate species that are true hermaphrodites, here the fish in the foreground is acting as a male, but thi...

Michel Roggo / Gallery forest along the channels dominated by mainly Willows (Salix sp.) and Poplars (Populus sp.) Danube Delta Biosphere Reserve, Danube Delta, Romania May 2015. Photographed for The Freshwater Pro...

Pat Tuson / Wind turbine in urban setting with flats behind, Mile End Park London Borough of Tower Hamlets, England, UK, March 2014.

Pat Tuson / Wind and solar powered lamppost, Mile End Park, London Borough of Tower Hamlets, England, UK, March 2014.

Pat Tuson / Wind and solar powered lamppost or lamp post alongside conventional lamppost with people passing, Mile End Park, London Borough of Tower Hamlets, England, UK, March 2014.

Pat Tuson / Wind and solar powered lamppost or lamp post, Mile End Park, London Borough of Tower Hamlets, England, UK, March 2014.

Peter Lewis / Canary Wharf skyscrapers reflected, London, England, UK, January 2014.

Ernie Janes / Landscape of Canary Wharf and Central London from Greenwich Park, London, England, UK, September 2015.

Matthew Maran / View of Canary Wharf from Hampstead Heath with Beech tree (Fagus sylvatica) Hampstead Heath, London, England, UK. March 2013. Small reproduction only.

Alex Mustard / Pair of Barred hamlets (Hypoplectrus puella) spawning at dusk. This species is hermaphrodite. Wreck of the Oro Verde, Grand Cayman, Cayman Islands. Caribbean Sea.

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

David Woodfall / Friends of Tower Hamlets Cemetery Community Conservation volunteer carrying out conservation work to clear ivy from graveyard, and planting flowers as nectar food plants for bees. Bow, London, England...

David Woodfall / Friends of Tower Hamlets Cemetery Community Conservation volunteers carrying out conservation work to clear ivy from graveyard, and planting flowers as nectar food plants for bees. Bow, London, Englan...

David Woodfall / Friends of Tower Hamlets Cemetery Community Conservation volunteers carrying out conservation work to clear ivy from graveyard and to plant flowers as nectar food plants for bees. Bow, London, England...

David Woodfall / Friends of Tower Hamlets Cemetery Community Conservation volunteers carrying out conservation work to clear ivy from graveyard, and planting flowers as nectar food plants for bees. Bow, London, Englan...

David Woodfall / Two wardens with bee hive, part of project by Friends of Tower Hamlets Cemetery,Tower Hamlets Cemetery, Bow, London, UK, September 2014.

Pat Tuson / CS2 Barclay's Cycle Superhighway Route Two with red London double-decker buses close alongside, Bow Road, London Borough of Tower Hamlets, England, UK, October 2013.

Pat Tuson / CS2 Barclay's Cycle Superhighway Route Two with red London double-decker buses close alongside, Bow Road, London Borough of Tower Hamlets, England, UK, October 2013.

Alex Mustard / Yellowbelly hamlet (Hypoplectrus aberrans) pair spawning at dusk with the fish in the foreground acting as male which may be a Shy/yellowbelly hamlet hybrid, George Town, Grand Cayman, Cayman Islands,...

Alex Mustard / Shy hamlets (Hypoplectrus guttavarius) pair spawning at dusk, George Town, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Butter hamlet (Hypoplectrus unicolor) pair spawning at dusk, George Town, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Butter hamlet (Hypoplectrus unicolor) pair spawning at dusk, George Town, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Indigo hamlets (Hypoplectrus indigo) pair spawning at dusk, George Town, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Barred hamlet (Hypoplectrus puella) pair spawning at dusk (long exposure used to produce blue background) George Town, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Yellowbelly hamlet (Hypoplectrus aberrans) pair spawning at dusk (a long exposure 1/10th produced the blue background) George Town, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Barred hamlet (Hypoplectrus puella) pair spawning at dusk with a diver watching, Georgetown, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea. Model released

Alex Mustard / Shy hamlet (Hypoplectrus guttavarius) pair spawning at dusk. Hamlets are one of the few vertebrate species that are true hermaphrodites, here the fish in the foreground is acting as a male, but this p...

Pete Oxford / Yellowtail hamlet (Hypoplectrus chlorurus) Bonaire, Netherlands Antilles, Caribbean

Michele Westmorland / Tan Hamlet, a hybrid of Yellowbelly and Shy hamlet(Hypoplectrus sp). St Vincent, West-Indies, Caribbean, May.

Michele Westmorland / Banded coral shrimp (Stenopus hispidus) and Hamlet (Hypoplectrus sp.), St Vincent, West-Indies, Caribbean, May.

Eric Baccega / Aerial view of Burden's Point, Salvage village, east coast of Newfoundland, Canada, September 2010

Eric Baccega / Aerial view of Burden's Point, Salvage village, east coast of Newfoundland, Canada, September 2010

Eric Baccega / Aerial view of Burden's Point, Salvage village, east coast of Newfoundland, Canada, September 2010

Eric Baccega / Aerial view of Burden's Point, Salvage village, east coast of Newfoundland, Canada, September 2010

Wild Wonders of Europe / Lilja / A small mountain village, Amigdalokefali, Crete, Greece, April 2009

Wild Wonders of Europe / Lilja / A small mountain village, Western Crete, Greece, April 2009

Nature Production / Butter hamlet {Hypoplectrus unicolor} Caribbean

Nature Production / Barred hamlet {Hypoplectrus puella} Caribbean

Nature Production / Indigo Hamlet {Hypoplectrus indigo} Caribbean

David Hall / Two Indigo hamlets (Hypoplectrus indigo) mating, they are simultaneous hermaphrodites, the individual acting as a male is wrapping around his partner, inducing her to release her eggs, Belize, Caribbe...

David Hall / Two Indigo hamlets (Hypoplectrus indigo) mating, they are simultaneous hermaphrodites, the individual acting as a male is wrapping around his partner, inducing her to release her eggs, Belize, Caribbe...

Alex Mustard / Long exposure showing a pair of Yellowbelly hamlets (Hypoplectrus aberrans), one is a hybird with Shy hamlet (Hypoplectrus guttavarius) spawning at dusk. George Town, Grand Cayman, Cayman Islands, Bri...