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...

Nigel Cattlin / Spanish bluebell (Hyacinthoides hispanica) cross section of bulb with leaf and root development. Cultivated in garden. January.

Nigel Cattlin / Spanish bluebell (Hyacinthoides hispanica) bulb with leaf and root development in late winter

Nigel Cattlin / Spanish bluebell (Hyacinthoides hispanica) bulb with leaf and root development in late winter

Cyril Ruoso / Professor Matsu's team studying cases of hybridisation between Japanese giant salamander (Andrias japonicus) and introduced Chinese giant salamander (Andrias davidianus) with specimen just caught in t...

Paul Harcourt Davies / Hybrid orchid (Ophrys x vespertilio) betwen the Bee orchid (Ophrys apifera) and Bertolonii's orchid (Ophrys bertolonii) Mount Amiata, Tuscany, Italy, June.

Paul Harcourt Davies / Hybrid orchid (Orchis x beyrichii). Hybrid of Monkey orchid (Orchis simia with Military orchid (Orchis militaris) near Leonessa, Umbria. Italy, June.

Paul Harcourt Davies / Hybrid Bee orchid (Ophrys albertiana). Hybrid of Late spider orchid (Ophrys fuciflora) and Bee orchid (Ophrys apifera) Sibillini, near Spoleto, Umbria, Italy, June.

Paul Harcourt Davies / Hybrid orchid (Orchiaceras bergonii), hybrid between Man orchid (Orchis anthropophorum) and Monkey orchid (Orchis simia) Preci near Norcia, Umbria, Italy. May.

Paul Harcourt Davies / Hybrid orchid (Orchis angustricruris), hybrid of Lady orchid (Orchis purpurea) and Monkey orchid (Orchis simia) Torrealfina, Orvieto, Umbria, Italy, May.

Paul Harcourt Davies / Hybrid orchid (Orchis x angustricruris), hybrid of Lady orchid (Orchis purpurea) and Monkey orchid (Orchis simia) Torrealfina, Orvieto, Umbria, Italy, May.

Paul Harcourt Davies / Hybrid orchid (Ophrys x hoeppneri), hybrid between Bumble Bee orchid (Ophrys bombyliflora) and Early spider (Ophrys sphegodes) orchid. Mount Argentario, Tuscany, Italy. April

Paul Harcourt Davies / Hybrid orchid (Orchiaceras x bivonae). Hybrid of Naked man orchid (Orchis italica) and Man orchid (Orchis anthrophorum) Monte St Angelo, Gargano, Puglia, Italy, April.

Paul Harcourt Davies / Hybrid orchid (Orchiaceras x bivonae) Hybrid of Naked man orchid (Orchis italica) and Man orchid (Orchis anthrophorum) Monte St Angelo, Gargano, Puglia, Italy, April.

Paul Harcourt Davies / Naked man orchid (Orchis italica) with hybrid orchid (Orchiaceras x bivonae). Hybrid of Naked man orchid (Orchis italica) and Man orchid (Orchis anthrophorum) Monte St Angelo, Gargano, Puglia, Italy,...

Paul Harcourt Davies / Hybrid Ophrys between Promontory orchid (Ophrys promontorii) and Siponto orchid (Ophrys sipontensis) near Ruggiano, Gargano, Puglia, Italy, April.

Paul Harcourt Davies / Hybrid orchid (Ophrys x flavicans). Hybrid of Bertoloni's Orchid (Ophrys bertolonii) and the Early spider orchid (Ophrys sphegodes) near Ruggiano, Gargano, Puglia, Italy, April.

Paul Harcourt Davies / Hybrid orchid (Ophrys montis-angeli). Hybrid between the Shield orchid (Ophrys biscutella) and Sawfly orchid (Ophrys tenthredinifera) near Ruggiano, Gargano, Puglia, Italy, April.

Paul Harcourt Davies / Hybrid orchid (Orchis x gennarii) between Green-winged orchid (Orchis morio) and Pink butterfly orchids (Orchis papilionacea) near Monte St Angelo, Gargano, Puglia, Italy, April.

Paul Harcourt Davies / Hybrid Ophrys orchid, hybrid of Dark ophrys (Ophrys passionis) and Ophrys archipelagi, Monte Nero, Gargano, Puglia, Italy, April.

Paul Harcourt Davies / Hybrid orchid (Ophrys x camusii), hybrid of Hornet orchid (Ophrys crabronifera) and Early spider ophrys (Ophrys spegodes) Piediluco, Terni, Umbria, Italy, May.

Paul Harcourt Davies / Hybrid orchid (Ophrys x camusii), hybrid of Hornet orchid (Ophrys crabronifera) and Early spider ophrys (Ophrys spegodes) Piediluco, Terni, Umbria, Italy, May.

Paul Harcourt Davies / Hybrid between Ophrys biancae and Ophrys calliantha, Ferla, Sicily, Italy, May.

Paul Harcourt Davies / Hybrid orchid (Orchis angusticuris). Hybrid of Lady orchid (Orchis purpurea) and Monkey orchid (Orchis simia) Torrealfina, Orvieto, Umbria, Italy, April.

Paul Harcourt Davies / Hybrid orchid (Orchis x angusticuris). Hybrid of Lady orchid (Orchis purpurea) and Monkey orchid (Orchis simia) Torrealfina, Orvieto, Umbria, Italy, April.

Paul Harcourt Davies / Hybrid orchid (Ophrys x francinae) hybrid of Sawfly orchid (Ophrys tenthredinifera) and Ophrys apulica, near Monte St Angelo, Gargano. Italy, April.

Paul Harcourt Davies / Ophrys hybrid of Sawfly orchid (Ophrys tenthredinifera) and Dark ophrys (Ophrys passionis) Ruggiano, Gargano, Puglia, Italy, April.

Paul Harcourt Davies / Hybrid ophrys, hybrid of Ophyrs crabronifera ssp biscutella x Ophrys passionis, near Ruggiano where numbers of hybrids occur. Monte St Angelo, Gargano, Puglia, Italy, April.

Paul Harcourt Davies / Hybrid orchid (Ophrys × azurea) of Promontory Ophrys (Ophrys promontorii) and Ophrys bertoloniiformis, Monte St Angelo, Gargano, Puglia, Italy, April.

Paul Harcourt Davies / Hybrid orchid (Ophrys x sommieri) hybrid of Sawfly (Ophrys tenthredinifera) and Bumble-bee orchids (Ophrys bombyliflora) Pescia Romana, Orbetello, Lazio, Italy, April.

Paul Harcourt Davies / Hybrid orchid (Ophrys x heraultii) beteewn Sawfly orchid (Ophrys tenthredinifera) and Mirror orchid (Orphys speculum) artificially produced. UK, April.

Paul Harcourt Davies / Hybrid orchid (Ophrys x arachnitiformis) hybrid of Early spider orchid (Ophrys sphegodes) and the Late spider orchid (Ophrys fuciflora) Porto Ferraio, Elba, Tuscany, Italy, March.

Paul Harcourt Davies / Hybrid orchid (Ophrys x macchiatii) hybrid of Early spider (Ophrys sphegodes) and Mirror orchids (Ophrys speculum) Porto Ferraio, Elba, Tuscany, Italy, March.

Paul Harcourt Davies / Hybrid orchid (Ophrys x pietschii) of Bee orchid (Ophrys apifera) and Fly orchid hybrid (insectifera) found just off the A303, Wiltshire, UK. June.

Paul Harcourt Davies / Ophrys × sorrentini, a hybrid of Bertolonii's orchid (Ophrys bertolonii) Sawfly Orchid (Ophrys tenthredinifera) Benano,near Orvieto, Umbria, Italy. May.

Paul Harcourt Davies / Hybrid Orchid (Ophrys x etrusca) hybrid of Early spider (Ophrys sphegodes) and Sawfly orchid (Ophrys tenthredinifera) Via Appia Antiha, Rome, Italy. May.

Paul Harcourt Davies / Lily beetles (Lilioceris lilii) mating on hybrid orchid, Ophrys lacaitae x Ophrys holoseria ssp gracilis, in woodland, near San Marco in Lamis, Puglia, Italy, May.

Paul Harcourt Davies / Hybrid orchid (Ophrys lacaitae x Ophrys holoseria ssp gracilis) in woodland, near San Marco in Lamis, Italy, May.

Paul Harcourt Davies / Hybrid orchid (Ophrys lacaitae x Ophrys holoseria ssp gracilis) in woodland, near San Marco in Lamis, Italy, May.

Paul Harcourt Davies / Natural hybrid orchid (Orchis x angusticruris) cross between Monkey orchid (Orchis simia) and Lady orchid (Orchis purpurea) near Torrealfina, Orvieto, Umbria, Italy, May.

Tim Laman / Ribbon-tailed Astrapia (Astrapia mayeri) adult male - possible hybrid with Stephanie's Astrapia (Astrapia stephaniae) Note wide tail and large black tips, Papua New Guinea

MYN / Paul Harcourt Davies / Callantha's Orchid (Ophrys oxyrrynchos ssp calliantha) a subspecies thought to have arisen from crosses between O. oxyrrynchos and O.candica, near Ferla, Sicily, May. Meetyourneighbours.net project

MYN / Paul Harcourt Davies / Orchid (O. X cosentiana nociana) hybrid between Ophrys fuciflora ssp. parvimaculata and Ophrys apulica, growing in moist-woodland above Lago di Varano, Gargano, Puglia, Italy, April. Meetyourneighbour...

MYN / Paul Harcourt Davies / Orchid hybrid (Ophry tenthredinifera neglecta X O. bertoloniformis) near Monte St Angelo, Gargano. Italy, April. Meetyourneighbours.net project

MYN / Paul Harcourt Davies / Hybrid orchid (Anacamptis x gennarii)between Green-winged and pink butterfly orchids (Ananamptis morio x Ancamptis papilionacea) near Monte St Angelo, Gargano. Italy, April.. Meetyourneighbours.net pr...

Steven David Miller / Dingo (Canis lupus dingo) probably part domestic camp dog, running through campground, Kakadu National Park, Northern Territory, Australia, June

Nick Upton / Boy running with pet dog (Canis familiaris) a 'goldendoodle' golden retriever / standard Poodle cross. Hampshire, UK, October. Model released.

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

Fabrice Cahez / Wild boar / Domestic pig hybrid (Sus scrofa) running, Vosges, France, May

Robin Chittenden / Barnacle x Canada Goose hybrid (Branta leucopsis canadensis). Suffolk, UK, February.

Alex Hyde / False oxlips (Primula vulgaris x veris), a hybrid of Cowslip and Common primrose, Peak District National Park, Derbyshire, April.

Alex Hyde / False oxlip (Primula vulgaris x veris), a hybrid of Cowslip and Common primrose, Peak District National Park, Derbyshire, April.

Juan Carlos Munoz / Tourist boat by icebergs in Jokulsarlon Lagoon, Vatnajokull Glacier, Iceland, July 2009

Juan Carlos Munoz / Amphibious tourist vehicle driving into the Jokulsarlon Lagoon, Vatnajokull Glacier, Iceland, July 2009

Bryan and Cherry Alexander / Dog handler with Domestic dog / Jackal cross, trained to detect explosives at Sheremetyevo Airport, Moscow, Russia, 2005.

Bryan and Cherry Alexander / Dog handler with Domestic dog / Jackal cross, trained to detect explosives at Sheremetyevo Airport, Moscow, Russia, 2005.

Bryan and Cherry Alexander / Dog handler with Domestic dog / Jackal cross, trained to detect explosives at Sheremetyevo Airport, Moscow, Russia, 2005.

Bryan and Cherry Alexander / Dog handler with domestic dog / Jackal cross, trained to detect explosives at Sheremetyevo Airport, Moscow, Russia, 2005.

Michel Poinsignon / Hybrid orchid, Fly orchid (Ophrys mouche) X Small spider orchid (Ophrys litigieux) in flower, Lorraine, France, April

Michel Poinsignon / Hydbrid orchid (Orchis militaris X Orchis purpurea) in flower, Lorraine, France, May

Jane Burton / Portrait of two young domestic Polecat-Ferrets (Mustela putorius furo) lying down together, aged 6 weeks.

Jane Burton / Portrait of two young domestic Polecat-Ferrets (Mustela putorius furo) lying down together, aged 6 weeks.

Peter Lewis / Hybrid of Lady orchid (Orchis purpurea) and Monkey orchid (Orchis simia) Hartslock, Oxfordshire, England, May

Peter Lewis / Hybrid of Lady Orchid (Orchis purpurea) and Monkey Orchid (Orchis simia) Hartslock, Oxfordshire, England

Peter Lewis / Hybrid of Lady Orchid (Orchis purpurea) and Monkey Orchid (Orchis simia) Hartslock, Oxfordshire, England

Peter Lewis / Purple variety of Green Winged Orchid (Orchis morio) Bishops Waltham, Hampshire, England, UK

Wild Wonders of Europe / Bartocha / Butterfly orchid x Green winged orchid (Orchis / Anacamptis papilionacea) x (Orchis / Anacamptis morio) flowers, Gargano National Park, Gargano Peninsula, Apulia, Italy

Wild Wonders of Europe / Bartocha / Butterfly orchid x Green winged orchid (Orchis / Anacamptis papilionacea) x (Orchis / Anacamptis morio) flowers, Gargano National Park, Gargano Peninsula, Apulia, Italy

Doug Perrine / Natural hybrid cross between Blue angelfish {Holacanthus bermudensis} and Queen angelfish {Holacanthus ciliaris} Texas, Gulf of Mexico, USA

Todd Pusser / Hybrid dolphin - Wholphin - False killer whale x Bottle nosed dolphin, Hawaii. {Pseudorca crassidens} x {Tursiops truncatus}

Juergen Freund / Sea snail shell specimen {Xenophora pallidula} Philippine

Pete Oxford / Tigon - hybrid tiger-lion: offspring of male tiger crossed with lioness 'Rangini', Calcutta Zoo, India. Crippled animal

Tony Phelps / Mountain Zebra Stallion/ horse hybrid. Overberg farmland, Western Cape, South Africa.

Todd Pusser / Hybrid dolphin - Wholphin - False killer whale x Bottle nosed dolphin, Hawaii. {Pseudorca crassidens} x {Tursiops truncatus}