RMK6538E–Adders or Northern Vipers Vipera berus. Sexually dimorphic in colour. Three males with a single female, top left. Ectothermic. Spring. Just emerged fr
RMHEWHPT–The Mandarin duck is a sexually dimorphic species, meaning males and females differ in appearance. The male has a rich, colorful appearance, which includes brown cheeks and a long brown and white crown sweeping back from the top of the head. The chest is dark purple, with black and white strips, and the wings are brown with an iridescent blue-green edge. This striking coloration helps the male attract the less-colorful females, which display brownish-black plumage with white markings around the eyes and along the throat. The Mandarin duck can be found in eastern Russia, China and Japan.
RMB1K3FK–Ruff (Ruff (Philomachus pugnax) Sweden - Male displaying on lek - Extremely sexually dimorphic ) Sweden - Male displaying on lek
RMRM0JRB–Malachite Beetle, Cordylepherus viridis on buttercup. Malachite Beetle, Cordylepherus viridis. a sexually dimorphic soft-bodied beetle often found in
RM2B01B4D–Indonesia/China: Greater Bird-of-paradise. Watercolour painting from a gouache album of various Chinese and Indonesian birds, 19th century. The greater bird-of-paradise (Paradisaea apoda) is a bird-of-paradise found in the lowland and hill forests of southwest New Guinea and Indonesia's Aru Islands. It has the most glamorous display in the bird world, with sexually dimorphic plumage, the females being quite plain compared to the males.
RFW8DMAW–Steller's eider
RM2A2MJNH–Eudynamys horonata, Print, Koel, The true koels, Eudynamys, are a genus of cuckoos from Asia, Australia and the Pacific. They are large sexually dimorphic cuckoos that eat fruits and insects and have loud distinctive calls. They are brood parasites, laying their eggs in the nests of other species., 1796-1808
RMHRPYP3–Ring-Necked or Rose-Ringed Parakeet, (Psittacula krameri), drinks water from a water pump, Keoladeo Ghana National Park, Bharatpur, Rajasthan, India
RM2J2HYY4–Great Currasow male in tree Crax rubra Boco Tapada, Costa Rica BI032989
RF2HJB8J0–The paradise riflebird (Lophorina paradisea) is a passerine bird of the family Paradisaeidae. Formerly a member of the genus Ptiloris, it has since been moved to the genus Lophorina alongside other riflebird species. It is found in subtropical, temperate rainforests in eastern Australia. The species is sexually dimorphic; the male is black with iridescent blue-green patches, while the female is gray-brown and white. tinted lithograph Illustrated by Joseph Smit, from the book ' The beautiful and curious birds of the world ' by Charles Barney Cory, Published by the Author for the subscribers Bos
RM2M6RE51–Male and female Black Howler monkey
RFMMBWMG–Rose-ringed or ring-necked parakeets (Psittacula krameri), on bird feeder in garden with snow. London, UK.
RM2JMRKR6–A female Doule-eyed Fig-parrot forages for food on the ground in Port Douglas, Queensland in Australia.
RFFM616B–Male alpine ibex, Capra ibex, in a glade with a female behind. This is a sexually dimorphic species with larger males who carry
RMW7WY20–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.
RF2E3HPMD–Male and female white-throated robin (Irania gutturalis [Here as Erithacus gutturalis]), or irania, is a small, sexually dimorphic, migratory passerine bird From the survey of western Palestine. The fauna and flora of Palestine by Tristram, H. B. (Henry Baker), 1822-1906 Published by The Committee of the Palestine Exploration Fund, London, 1884
RFMD5D83–Close shot of a spray of blue flowers with long narrow petals against a blurred sub-tropical garden background
RFHP4Y4N–A Beautiful Male American Kestrel Perched on a Tree Branch
RMHEWEM9–The gorgeously coloured Cruiser is one of the most familiar species in the Oriental region, but it is only the male which has the dazzling orange wings - like all members of the genus Vindula this species is sexually dimorphic. The females are similar to the bright orange males in pattern, but have a grey ground colour, and a broad white post-median band extending across both wings.
RFFE117E–Notostira elongata Mirid bug. A sexually dimorphic grass bug in the family Miridae, with males such as this showing a contrastin
RMRM0JRD–Malachite Beetle, Cordylepherus viridis on buttercup. Malachite Beetle, Cordylepherus viridis. a sexually dimorphic soft-bodied beetle often found in
RM2B01B48–Indonesia/China: Greater Bird-of-paradise. Watercolour painting from a gouache album of various Chinese and Indonesian birds, 19th century. The greater bird-of-paradise (Paradisaea apoda) is a bird-of-paradise found in the lowland and hill forests of southwest New Guinea and Indonesia's Aru Islands. It has the most glamorous display in the bird world, with sexually dimorphic plumage, the females being quite plain compared to the males.
RF2H61H82–Sinai Rosefinch
RM2A2MJP0–Eudynamys horonata, Print, Koel, The true koels, Eudynamys, are a genus of cuckoos from Asia, Australia and the Pacific. They are large sexually dimorphic cuckoos that eat fruits and insects and have loud distinctive calls. They are brood parasites, laying their eggs in the nests of other species., 1809-1845
RF2M1GK6K–eland antelope nurses his calf
RM2J2HYYM–Great Currasow male in tree Crax rubra Boco Tapada, Costa Rica BI032997
RF2KDX4R6–Apprehensive timorous female Golden Pheasant peeping out of the undergrowth.
RF2G8MWN3–Ruby Throated Hummingbird at Feeder
RFMMBWND–Rose-ringed or ring-necked parakeet (Psittacula krameri), on bird feeder in garden with snow. London, UK.
RM2JMRKRA–A female Doule-eyed Fig-parrot forages for food on the ground in Port Douglas, Queensland in Australia.
RM2GN1TT8–Male Red-Wing Blackbird (Agelaius phoeniceus) shows red wing patch territorial display in Cattail marsh, Castle Rock Colorado USA. Photo taken in May.
RF2F4C5TG–A pair of purple martins sitting on a nest box.
RF2DB3W7P–Spréo améthyste The violet-backed starling (Cinnyricinclus leucogaster), also known as the plum-coloured starling or amethyst starling, is a relatively small species (17cm) of starling in the family Sturnidae. It is the only member of the genus Cinnyricinclus. This strongly sexually dimorphic species is found widely in the woodlands and savannah forest edges of mainland sub-Saharan Africa. It is rarely seen on the ground, but instead found in trees and other sources away from the ground. from the Book Histoire naturelle des oiseaux d'Afrique [Natural History of birds of Africa] Volume 2, by Le
RFB04NRF–A European Teal feeding
RMHPHAWK–Orange Barred Sulphur Yelllow Butterfly
RF2ERG89A–The female Superb Fruit Dove (Ptilinopus superbus). It is sexually dimorphic. Females are mostly green, with a white abdomen, blue wing tips
RM2A9CDYW–HOUSE SPARROW (Passer domesticus). Hen or female bird. Sexually dimorphic. Perching on the back of a garden seat.
RMHEWGTA–The rose-ringed parakeet (Psittacula krameri), also known as the ring-necked parakeet, is a gregarious tropical Afro-Asian parakeet species that has an extremely large range. The rose-ringed parakeet is sexually dimorphic. The adult male sports a red or black neck ring and the hen and immature birds of both sexes either show no neck rings, or display shadow-like pale to dark grey neck rings. Both sexes have a distinctive green colour. Rose-ringed parakeets measure on average 40 cm (16 in) in length, including the tail feathers, a large portion of their total length. Their average single-wing
RMH3D61N–Mating pair of sexually dimorphic Norhayati's Flying Frog in amplexus in the tropical rainforest of Malaysia
RMRM0JRH–Malachite Beetle, Cordylepherus viridis on buttercup. Malachite Beetle, Cordylepherus viridis. a sexually dimorphic soft-bodied beetle often found in
RF2KEAPWE–crab spider camouflaged on a white flower while catching a bumblebee
RF2H61HBK–Sinai Rosefinch
RM2A2MJP1–Eudynamys mindanensis, Print, Koel, The true koels, Eudynamys, are a genus of cuckoos from Asia, Australia and the Pacific. They are large sexually dimorphic cuckoos that eat fruits and insects and have loud distinctive calls. They are brood parasites, laying their eggs in the nests of other species., 1700-1880
RF2B7HYK7–Fiddler Crab, genus Ocypode, Uca sp, Florida, UKA, on beach, large sexually dimorphic claw, male,
RM2J2HYYX–Great Currasow male in tree Crax rubra Boco Tapada, Costa Rica BI033001
RF2M82YMC–Spectacular majestic male Satin Bowerbird with radiant dark blue glossy plumage.
RF2G8MWMN–Ruby Throated Hummingbird at Feeder
RFMMBWKY–Rose-ringed or ring-necked parakeet (Psittacula krameri), blue mutation on bird feeder in garden with snow. London, UK. The blue bird is ringed, pos
RF2P3PD6E–Common Wallaroo - Osphranter robustus also called euro or hill wallaroo, mostly nocturnal and solitary, loud hissing noise, sexually dimorphic, like m
RM2G7FD8F–Male Red Wing Black Bird (Agelaius phoeniceus) shows territorial colored wing patch in cattail marsh, Castle Rock Colorado USA. Photo taken in May.
RF2JJTGMG–shallow depth of field photo of captive bred pet sexually dimorphic Eclectus roratus parrots sitting on a branch, one is male green eclectus parrot th
RM2G8KX1W–The Alpine ibex (Capra ibex), also known as the steinbock, bouquetin, or simply ibex, is a species of wild goat that lives in the mountains of the European Alps. It is a sexually dimorphic species: males are larger and carry longer, curved horns than females. Its coat colour is typically brownish grey. Alpine ibex tend to live in steep, rough terrain near the snow line. They are also social, although adult males and females segregate for most of the year, coming together only to mate. Four distinct groups exist; adult male groups, female-offspring groups, groups of young individuals, and mixed
RF2HB9YY9–Illustration of a male and female white-throated robin (Irania gutturalis, here as Erithacus gutturalis), or irania, a small, sexually dimorphic, migratory passerine bird. Illustration from 'The Survey of Western Palestine. The Fauna and Flora of Palestine' by Henry Baker Tristram (1822-1906). Published by The Committee of the Palestine Exploration Fund, London, 1884.
RMHT15MY–Orange Barred Sulphur Yelllow Butterfly
RF2KA83HD–Sri Lankan green pitviper (Craspedocephalus trigonocephalus) is a venomous pit viper species endemic to Sri Lanka. a sexually dimorphic, mid-sized
RMK6558P–Adders or Northern Vipers Vipera berus. Sexually dimorphic in colour. Two males with a single female. On a rusting metal sheet. Ectothermic.
RM2H1A9AD–Red Winged Blackbird, , Agelaius phoeniceus, Burnaby Lake Regional Park, Burnaby, British Columbia, Canada
RMH3D61P–Mating pair of sexually dimorphic Norhayati's Flying Frog in amplexus in the tropical rainforest of Malaysia
RMRM0K7T–Male Large Red Damselfly, Pyrrhosoma nymphula is a European damselfly with extended area into North Africa. Length 33â. “36 mm. Sexually dimorphic.
RM2KFB1EE–Fiddler Crabs living in a muddy bank, at the Kayak Launching area at the Eastern Shore of Virginia National Wildlife Refuge, Delmarva Peninsula,
RF2H61H96–Sinai Rosefinch
RM2A2MJN1–Eudynamys horonata, Print, Koel, The true koels, Eudynamys, are a genus of cuckoos from Asia, Australia and the Pacific. They are large sexually dimorphic cuckoos that eat fruits and insects and have loud distinctive calls. They are brood parasites, laying their eggs in the nests of other species., 1700-1880
RMB7PTTK–ferret Mustela putorius furo dimorphic predators brown black white mixed fur
RM2J2HYT5–Great Currasow - female in tree Crax rubra Boco Tapada, Costa Rica BI032962
RF2K5RG2Y–A closeup portrait of a tender devoted Red-tailed Black Cockatoo couple in an affectionate pose.
RFJ9YX5K–One male Bullock's Oriole perched in a tree looking down at a nest. Bullock's orioles are sexually dimorphic, with males being more brightly colored t
RFMMBWKP–Rose-ringed or ring-necked parakeet (Psittacula krameri), blue mutation on bird feeder in garden in rain. London, UK. The blue bird is ringed, possi
RF2P3PD75–Common Wallaroo - Osphranter robustus also called euro or hill wallaroo, mostly nocturnal and solitary, loud hissing noise, sexually dimorphic, like m
RM2FWNM6B–Male Red-Winged Blackbird (Agelaius phoeniceus) with wings spread in territorial display in Cattail marsh, Castle Rock Colorado USA.Photo taken in May.
RF2HCDFXH–shallow depth of field photo of captive bred pet sexually dimorphic Eclectus roratus parrots sitting on a branch, one is male green eclectus parrot th
RFT00KB7–Chital (Axis axis) drinking from watering hole in India
RFW4KN6T–Venomous Hump Nose Viper
RF2JBGT20–Male violet-backed starling (Cinnyricinclus leucogaster), also known as the plum-coloured starling or amethyst starling. The male of this sexually di
RF2KA83H4–Sri Lankan green pitviper (Craspedocephalus trigonocephalus) is a venomous pit viper species endemic to Sri Lanka. a sexually dimorphic, mid-sized
RM2H1A99N–Red Winged Blackbird, , Agelaius phoeniceus, Burnaby Lake Regional Park, Burnaby, British Columbia, Canada
RMH3D61K–Mating pair of sexually dimorphic Norhayati's Flying Frog in amplexus in the tropical rainforest of Malaysia
RMRM0K7R–Male Large Red Damselfly, Pyrrhosoma nymphula is a European damselfly with extended area into North Africa. Length 33â. “36 mm. Sexually dimorphic.
RM2KFB0YG–Fiddler Crabs living in a muddy bank, at the Kayak Launching area at the Eastern Shore of Virginia National Wildlife Refuge, Delmarva Peninsula,
RF2H61HE5–Sinai Rosefinch
RM2A2MJMK–Eudynamys horonata, Print, Koel, The true koels, Eudynamys, are a genus of cuckoos from Asia, Australia and the Pacific. They are large sexually dimorphic cuckoos that eat fruits and insects and have loud distinctive calls. They are brood parasites, laying their eggs in the nests of other species., 1700-1880
RMG14W4P–Woodcut of 'the Bird of Paradise' from Des Monstres et prodiges by Ambroise Paré, 1573. Des Monstres is filled with unsubstantiated accounts of sea devils, marine sows, and monstrous animals with human faces. With its extensive discussion of reproduction
RM2J2HYWT–Great Currasow male in flight Crax rubra Boco Tapada, Costa Rica BI032979
RF2KAB2B6–Arresting elegant male Lady Amherst's Pheasant with magnificent glamorous plumage.
RF2B9281R–Tchitrea pyrrhoptera, Print, The paradise flycatchers (Terpsiphone), are a genus of bird in the family Monarchidae. The genus ranges across Africa and Asia, as well as a number of islands. A few species are migratory, but the majority are resident. The most telling characteristic of the genus is the long tail streamers of the males of many species. In addition to the long tails the males and females are sexually dimorphic and have rufous, black and white plumage., 1700-1880, Reimagined by Gibon, design of warm cheerful glowing of brightness and light rays radiance. Classic art reinvented with
RFMMBWJW–Rose-ringed or ring-necked parakeet (Psittacula krameri), blue mutation on bird feeder in garden.a with normal coloured parakeet in background. Londo
RF2P3PD90–Common Wallaroo - Osphranter robustus also called euro or hill wallaroo, mostly nocturnal and solitary, loud hissing noise, sexually dimorphic, like m
RM2GM0CMB–Male Red-Winged Blackbird (Agelaius phoeniceus) showing it's red territorial display in Cattail marsh, Castle Rock Colorado USA. Photo taken in May.
RF2AT7DPX–two captive bred sexually dimorphic Eclectus roratus parrots sitting on a branch, one is male green parrot the other is a female red and blue parrot
RF2D6P3C5–Plum-headed parakeet (Psittacula cyanocephala) is perched in a tree in India
RFW4KN9X–Venomous Hump Nose Viper
RMM1R2JG–An 1889 illustration from Chamber's Encyclopedia -illustration of an ADDAX aka White or Screwhorn Antelope (Antilope addax) or (Addax nasomaculatus)
RMBDKCHW–Adder or Norther Viper (Vipera berus). Sexually dimorphic. Female top, male below. Dorsal view.
RM2H1A9C2–Red Winged Blackbird, Agelaius phoeniceus, George C. Reifel Migratory Bird Sanctuary, Delta, British Columbia, Canada
RME9GW3P–Mating pair of Dwarf Stream Toad (Ingerophrynus parvus) in amplexus in the tropical rainforest of Malaysia
RMRM0K7W–Male Large Red Damselfly, Pyrrhosoma nymphula is a European damselfly with extended area into North Africa. Length 33â. “36 mm. Sexually dimorphic.
RM2KFB176–Fiddler Crabs living in a muddy bank, at the Kayak Launching area at the Eastern Shore of Virginia National Wildlife Refuge, Delmarva Peninsula,
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