• Results for
    • Dimorphic
  • (663)
Devil Angler (Linophryne indica) fish, deep sea species showing large female with dwarf male attached - Norbert Wu
00977200
Norbert Wu / Devil Angler (Linophryne indica) fish, deep sea species showing large female with dwarf male attached
Black Bear (Ursus americanus) 7 week old cubs playing in den. One cub shows brown color phase while the other shows black color phase - Suzi Eszterhas
00761737
Suzi Eszterhas / Black Bear (Ursus americanus) 7 week old cubs playing in den. One cub shows brown color phase while the other shows black color phase
Northern Pintail (Anas acuta) males flying with female in spring courtship display, Montana - Donald M. Jones
00590905
Donald M. Jones / Northern Pintail (Anas acuta) males flying with female in spring courtship display, Montana
Bighorn Sheep (Ovis canadensis) female and male in winter, Jasper National Park, Alberta, Canada - Donald M. Jones
00590758
Donald M. Jones / Bighorn Sheep (Ovis canadensis) female and male in winter, Jasper National Park, Alberta, Canada
Stick Insect (Monticomorpha flavolimbata) pair mating in mountains, Bengoh Range, Ecuador - Chien Lee
00580416
Chien Lee / Stick Insect (Monticomorpha flavolimbata) pair mating in mountains, Bengoh Range, Ecuador
Bighorn Sheep (Ovis canadensis) ewe and ram, western Montana - Donald M. Jones
00578809
Donald M. Jones / Bighorn Sheep (Ovis canadensis) ewe and ram, western Montana
Dall's Sheep (Ovis dalli) ram, lamb, and ewe, Yukon Territory, Canada - Michael Quinton
00572988
Michael Quinton / Dall's Sheep (Ovis dalli) ram, lamb, and ewe, Yukon Territory, Canada
Green Anaconda (Eunectes murinus) female constricting male after copulation, after which she will consume him, Brazil - Luciano Candisani
00568879
Luciano Candisani / Green Anaconda (Eunectes murinus) female constricting male after copulation, after which she will consume him, Brazil
Northern Bobwhite (Colinus virginianus) female and male, Texas - Alan Murphy/ BIA
00563501
Alan Murphy/ BIA / Northern Bobwhite (Colinus virginianus) female and male, Texas
Indian Peafowl (Pavo cristatus) female watching male performing courtship display, Castilla Leon, Spain - Brais Seara Fernandez/ BIA
00559974
Brais Seara Fernandez/ BIA / Indian Peafowl (Pavo cristatus) female watching male performing courtship display, Castilla Leon, Spain
Elk (Cervus elaphus) bull and harem of females and calves along river, Athabasca River, western Canada - Donald M. Jones
00557941
Donald M. Jones / Elk (Cervus elaphus) bull and harem of females and calves along river, Athabasca River, western Canada
Bighorn Sheep (Ovis canadensis) rams, ewe, and lamb, western Canada - Donald M. Jones
00557774
Donald M. Jones / Bighorn Sheep (Ovis canadensis) rams, ewe, and lamb, western Canada
Gambel's Quail (Callipepla gambelii) male at left with female, Arizona - Rick Bowers/ BIA
00556889
Rick Bowers/ BIA / Gambel's Quail (Callipepla gambelii) male at left with female, Arizona
Svalbard Reindeer (Rangifer tarandus platyrhynchus) male and females running, Spitsbergen, Svalbard, Norway - Roland Seitre
00555749
Roland Seitre / Svalbard Reindeer (Rangifer tarandus platyrhynchus) male and females running, Spitsbergen, Svalbard, Norway
Svalbard Reindeer (Rangifer tarandus platyrhynchus) pair, Spitsbergen, Svalbard, Norway - Roland Seitre
00555747
Roland Seitre / Svalbard Reindeer (Rangifer tarandus platyrhynchus) pair, Spitsbergen, Svalbard, Norway
Gelada Baboon (Theropithecus gelada) male and females huddling for warmth, Simien Mountains National Park, Ethiopia - Thomas Marent
00554725
Thomas Marent / Gelada Baboon (Theropithecus gelada) male and females huddling for warmth, Simien Mountains National Park, Ethiopia
Northern Bobwhite (Colinus virginianus) female and male, Texas - Alan Murphy
00547926
Alan Murphy / Northern Bobwhite (Colinus virginianus) female and male, Texas
Eastern Bluebird (Sialia sialis) male and female, Texas - Alan Murphy
00547902
Alan Murphy / Eastern Bluebird (Sialia sialis) male and female, Texas
Eastern Bluebird (Sialia sialis) male and female, Texas - Alan Murphy
00547538
Alan Murphy / Eastern Bluebird (Sialia sialis) male and female, Texas
Cheetah (Acinonyx jubatus) chasing Impala (Aepyceros melampus) female, Masai Mara, Kenya - Anup Shah
00543764
Anup Shah / Cheetah (Acinonyx jubatus) chasing Impala (Aepyceros melampus) female, Masai Mara, Kenya
Bighorn Sheep (Ovis canadensis) ram and ewe during rut, Montana - Donald M. Jones
00535405
Donald M. Jones / Bighorn Sheep (Ovis canadensis) ram and ewe during rut, Montana
Bighorn Sheep (Ovis canadensis) ram and female, western Montana - Donald M. Jones
00521544
Donald M. Jones / Bighorn Sheep (Ovis canadensis) ram and female, western Montana
African Lion (Panthera leo) pair mating, Khutse Game Reserve, Botswana - Vincent Grafhorst
00449263
Vincent Grafhorst / African Lion (Panthera leo) pair mating, Khutse Game Reserve, Botswana
African Lion (Panthera leo) male and female courting, Khutse Game Reserve, Botswana - Vincent Grafhorst
00449261
Vincent Grafhorst / African Lion (Panthera leo) male and female courting, Khutse Game Reserve, Botswana
Black-faced Impala (Aepyceros melampus petersi) male, females, and young drinking at waterhole, Etosha National Park, Namibia - Michael & Patricia Fogden
00423279
Michael & Patricia Fogden / Black-faced Impala (Aepyceros melampus petersi) male, females, and young drinking at waterhole, Etosha National Park, Namibia
Bearded Weevil (Rhinostomus barbirostris) species displays interesting sexual polymorphism, Costa Rica - Piotr Naskrecki
00298031
Piotr Naskrecki / Bearded Weevil (Rhinostomus barbirostris) species displays interesting sexual polymorphism, Costa Rica
Chachi Tree Frog (Hyla picturata) pair, Cotacachi-Cayapas Reserve, northwest Ecuador - Pete Oxford
00216500
Pete Oxford / Chachi Tree Frog (Hyla picturata) pair, Cotacachi-Cayapas Reserve, northwest Ecuador
Chachi Tree Frog (Hyla picturata) pair, Cotacachi-cayapas Reserve, northwest Ecuador - Pete Oxford
00216499
Pete Oxford / Chachi Tree Frog (Hyla picturata) pair, Cotacachi-cayapas Reserve, northwest Ecuador
Chachi Tree Frog (Hyla picturata) pair, Cotacachi-Cayapas Reserve, northwest Ecuador - Pete Oxford
00216498
Pete Oxford / Chachi Tree Frog (Hyla picturata) pair, Cotacachi-Cayapas Reserve, northwest Ecuador
Fiddler Crab (Uca maracoani) waving, Caroni Swamps, Trinidad, West Indies - Konrad Wothe
00197159
Konrad Wothe / Fiddler Crab (Uca maracoani) waving, Caroni Swamps, Trinidad, West Indies
Great Frigatebird (Fregata minor) courting males vying for female's attention, Genovesa Tower Island, Galapagos Islands, Ecuador - Tui De Roy
00141722
Tui De Roy / Great Frigatebird (Fregata minor) courting males vying for female's attention, Genovesa Tower Island, Galapagos Islands, Ecuador
Great Frigatebird (Fregata minor) recently formed pair, female inspecting male in courtship display with extended gular pouch, Genovesa Tower Island, Galapagos Islands, Ecuador - Tui De Roy
00141693
Tui De Roy / Great Frigatebird (Fregata minor) recently formed pair, female inspecting male in courtship display with extended gular pouch, Genovesa Tower Island, Galapagos Islands, Ecuador
Old-world Chameleons, male and female preparing to mate, Africa - Norbert Wu
00135659
Norbert Wu / Old-world Chameleons, male and female preparing to mate, Africa
Australian Sea Lion (Neophoca cinerea) male approaching a female to mate, Australia - Mitsuaki Iwago
00123856
Mitsuaki Iwago / Australian Sea Lion (Neophoca cinerea) male approaching a female to mate, Australia
African Lion (Panthera leo) male and female, Masai Mara National Reserve, Kenya - Shin Yoshino
00123748
Shin Yoshino / African Lion (Panthera leo) male and female, Masai Mara National Reserve, Kenya
Ostrich (Struthio camelus) male and two females running, Serengeti National Park, Tanzania - Mitsuaki Iwago
00115838
Mitsuaki Iwago / Ostrich (Struthio camelus) male and two females running, Serengeti National Park, Tanzania
African Lion (Panthera leo) couple fighting during mating, Serengeti National Park, Tanzania - Mitsuaki Iwago
00113768
Mitsuaki Iwago / African Lion (Panthera leo) couple fighting during mating, Serengeti National Park, Tanzania
Strawberry Poison Dart Frog (Oophaga pumilio) group showing color variation from different islands, Bocas del Toro, Panama - Mark Moffett
00109045
Mark Moffett / Strawberry Poison Dart Frog (Oophaga pumilio) group showing color variation from different islands, Bocas del Toro, Panama
Dimorphic egret (Egretta dimorpha) in white phase, flying, Ankarafantsika National Park, Madagascar - Bernard Castelein
01551869
Bernard Castelein / Dimorphic egret (Egretta dimorpha) in white phase, flying, Ankarafantsika National Park, Madagascar
Illustration of Cowslips (Primula veris) from 'Darwinism' by Alfred Wallace 1889. In 1862 Darwin reported how Primula plants have two forms of flowers, pin and thrum eyed,  differing in the height and... - Paul  D Stewart
01546288
Paul D Stewart / Illustration of Cowslips (Primula veris) from 'Darwinism' by Alfred Wallace 1889. In 1862 Darwin reported how Primula plants have two forms of flowers, pin and thrum eyed, differing in the height and...
Portraits of Cowslip (Primula veris) flowers,  pin and thrum eyed,  showing heterostyly ie  stigma at different positions. This was noted by Darwin and shows a mechanism to avoid self fertilisation. - Paul  D Stewart
01546249
Paul D Stewart / Portraits of Cowslip (Primula veris) flowers, pin and thrum eyed, showing heterostyly ie stigma at different positions. This was noted by Darwin and shows a mechanism to avoid self fertilisation.
Dimorphic Egret (Egretta dimorpha) on edge of Aldabra lagoon with coral 'mushrooms', Natural World Heritage Site, Aldabra 2006 - Willem  Kolvoort
01536565
Willem Kolvoort / Dimorphic Egret (Egretta dimorpha) on edge of Aldabra lagoon with coral 'mushrooms', Natural World Heritage Site, Aldabra 2006
Dimorphic Egret (Egretta dimorpha) on edge of Aldabra lagoon with coral 'mushrooms', Natural World Heritage Site, Aldabra 2006 - Willem  Kolvoort
01536559
Willem Kolvoort / Dimorphic Egret (Egretta dimorpha) on edge of Aldabra lagoon with coral 'mushrooms', Natural World Heritage Site, Aldabra 2006
Dimorphic Egret (Egretta dimorpha) and Crab plovers (Dromas ardeola) on edge of Aldabra lagoon with coral 'mushrooms', Natural World Heritage Site, Aldabra 2006 - Willem  Kolvoort
01536557
Willem Kolvoort / Dimorphic Egret (Egretta dimorpha) and Crab plovers (Dromas ardeola) on edge of Aldabra lagoon with coral 'mushrooms', Natural World Heritage Site, Aldabra 2006
Dimorphic Egret (Egretta dimorpha) and Crab plovers (Dromas ardeola) on edge of Aldabra lagoon with coral 'mushrooms', Natural World Heritage Site, Aldabra 2006 - Willem  Kolvoort
01536556
Willem Kolvoort / Dimorphic Egret (Egretta dimorpha) and Crab plovers (Dromas ardeola) on edge of Aldabra lagoon with coral 'mushrooms', Natural World Heritage Site, Aldabra 2006
Standard Radolfzell rings and colour-rings for northern goshawk (Accipiter gentilis) ringing. Two different sizes as males and females are sexually dimorphic. Berlin, Germany. March 2014. - Sam Hobson
01475500
Sam Hobson / Standard Radolfzell rings and colour-rings for northern goshawk (Accipiter gentilis) ringing. Two different sizes as males and females are sexually dimorphic. Berlin, Germany. March 2014.
Leafhoppers (Cicadellidae) mating, while a small leafhopper crawls on the back of the male. Male and female of this species are dimorphic. Upland rainforest near Archidona, Ecuador - Visuals Unlimited
01437243
Visuals Unlimited / Leafhoppers (Cicadellidae) mating, while a small leafhopper crawls on the back of the male. Male and female of this species are dimorphic. Upland rainforest near Archidona, Ecuador
Sexually dimorphic St. Mark's fly / March fly (Bibio marci) pair mating; males have much larger eyes and clear wings, Wiltshire garden, UK, May. - Nick Upton
01419741
Nick Upton / Sexually dimorphic St. Mark's fly / March fly (Bibio marci) pair mating; males have much larger eyes and clear wings, Wiltshire garden, UK, May.
Next page