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  • Mating lions in Nairobi NP, Kenya.
    55331-D.jpg
  • Mating lions in Nairobi NP, Kenya.
    55334-D.jpg
  • Mating lions in Nairobi NP, Kenya.
    55330-D.jpg
  • Mating pair of lions in Nairobi National Park, Kenya.
    55275-D.jpg
  • Mating lions in Nairobi NP, Kenya.
    55332-D.jpg
  • Mating pair of lions in Nairobi National Park, Kenya.
    55329-D.jpg
  • Mating lions in Nairobi NP, Kenya.
    55333-D.jpg
  • Tired mating pair of lions in Nairobi National Park, Kenya.
    55276-D.jpg
  • Mating lions in Nairobi NP, Kenya.
    55335-D.jpg
  • Pair of yellow-banded conops (Conops quadrifasciatus) mating. Photo from southern Norway ina August.
    9610-D.jpg
  • Pair of yellow-banded conops (Conops quadrifasciatus) mating. Photo from southern Norway ina August.
    9611-D.jpg
  • New zooids formin as the colony of sea squirts (Pycnoclavella sp.?) replicates. Aquariumphoto
    10122.jpg
  • Large katydid laying eggs on a tree trunk in the rainforest of Tanjung Puting National Park, Kalimantan, Borneo, Indonesia.
    9717-D.jpg
  • A pair of Green Sea Turtles (Chelonia mydas) mate off Espumilla Beach, James Bay, Santiago Island, Galapagos.
    3987-D.jpg
  • Black-legged kittiwakes (Rissa tridactyla) nesting in the window shelf of an old boathouse in Vadsö, Varanger, eastern Finnmark, Norway in March.
    44496-D.jpg
  • A nymph of the black-tailed skimmer (Orthetrum cancellatum) undergoes transition and becomes an adult dragonfly in the process known as incomplete metamorphosis. Photo from Vejlerne, northern Denmark in June.
    9628-D.jpg
  • A nymph of the black-tailed skimmer (Orthetrum cancellatum) undergoes transition and becomes an adult dragonfly in the process known as incomplete metamorphosis. Photo from Vejlerne, northern Denmark in June.
    9635-D.jpg
  • Female Olive baboon (Papio anubis) with recently born baby. Photo from Maasai Mara, Kenya.
    56113-D.jpg
  • Craneflies (family Tipulidae) mating. Photo from Andasibe, Madagascar.
    9547-D.jpg
  • Gentoo penguin (Pygoscelis papua) nesting at Sea Lion Island, the Falklands.
    43391-D.jpg
  • Breeding magellanic penguins (Sphreniscus magellanicus) outside their burrows at Saunders Island, the Falkland Islands.
    43273-D.jpg
  • Pair of Galapagos Penguins (Spheniscus mendiculus) mating on the island of Santiago
    42236-D.jpg
  • Male flowers of scots pine (Pinus sylvestris) are releasing the pollen.
    112135-D.jpg
  • Male flowers of scots pine (Pinus sylvestris) are releasing the pollen.
    112134-D.jpg
  • Angry male shelduch (Tadorna tadorna) chasing off a craw and protecting the chicks.
    44995-D.jpg
  • Agressive male shelduch (Tadorna tadorna) chasing off the female and protecting the chicks.
    44994-D.jpg
  • Female shelduck (Tadorna tadorna) with chicks. Photo from Vejlerne, northern Denmark in June.
    44993-D.jpg
  • Red-footed Booby (Sula sula) nesting at Genovesa, Galapagos.
    44833-D.jpg
  • White morth of Red-footed Booby (Sula sula) nesting at Genovesa, Galapagos.
    44819-D.jpg
  • A pair of Green Sea Turtles (Chelonia mydas) mate off Espumilla Beach, James Bay, Santiago Island, Galapagos.
    3986-D.jpg
  • Juvenile sand martins (Riparia riparia) in their nest burrows. Photo from south-western Norway in August.
    44746-D.jpg
  • Hungry sand martin chicks (Riparia riparia) screaming for their mother to return with food. Photo from south-western Norway in August.
    44745-D.jpg
  • Juvenile sand martins (Riparia riparia) watching the mother approaching their nest cave. Photo from south-western Norway in August.
    44742-D.jpg
  • Juvenile sand martins (Riparia riparia) being fed in their burrows by their adult mother. Photo from south-western Norway in August.
    44743-D.jpg
  • Female house sparrow (Passer domesticus) feeding a large chick.  South-western Norway in mid May.
    44679-D.jpg
  • Female house sparrow (Passer domesticus) feeding a large chick.  South-western Norway in mid May.
    44672-D.jpg
  • Male house sparrow (Passer domesticus) feeding a large chick.  South-western Norway in mid May.
    44671-D.jpg
  • Male house sparrow feeding a large chick.  Photo from Hidra, south-western Norway in mid May. Nikon D500, 600mm (900mm in full frame), f4, 1/400sec, ISO640, Manual modus.
    Growing up (44636-D).jpg
  • Great Black-backed Gull (Larus marinus) nesting. Photo from Hidra, south-western Norway in early May.
    44634-D.jpg
  • Great Black-backed Gull (Larus marinus) nesting. Photo from Hidra, south-western Norway in early May.
    44633-D.jpg
  • Black-legged kittiwakes (Rissa tridactyla) nesting in the window shelf of an old boathouse in Vadsö, Varanger, eastern Finnmark, Norway in March.
    44494-D.jpg
  • Black-legged kittiwakes (Rissa tridactyla) nesting in the window shelf of an old boathouse in Vadsö, Varanger, eastern Finnmark, Norway in March.
    44495-D.jpg
  • Black-legged kittiwakes (Rissa tridactyla) nesting in the window shelf of an old boathouse in Vadsö, Varanger, eastern Finnmark, Norway in March.
    44497-D.jpg
  • A nymph of the black-tailed skimmer (Orthetrum cancellatum) undergoes transition and becomes an adult dragonfly in the process known as incomplete metamorphosis. Photo from Vejlerne, northern Denmark in June.
    9645-D.jpg
  • A nymph of the black-tailed skimmer (Orthetrum cancellatum). Photo from Vejlerne, northern Denmark in June.
    9642-D.jpg
  • Female of a newly transformed black-tailed skimmer (Orthetrum cancellatum) from Vejlerne, northern Denmark in June.
    9640-D.jpg
  • Female of a newly transformed black-tailed skimmer (Orthetrum cancellatum) from Vejlerne, northern Denmark in June.
    9639-D.jpg
  • A nymph of the black-tailed skimmer (Orthetrum cancellatum) undergoes transition and becomes an adult dragonfly in the process known as incomplete metamorphosis. Photo from Vejlerne, northern Denmark in June.
    9625-D.jpg
  • A nymph of the black-tailed skimmer (Orthetrum cancellatum) undergoes transition and becomes an adult dragonfly in the process known as incomplete metamorphosis. Photo from Vejlerne, northern Denmark in June.
    9627-D.jpg
  • A nymph of the black-tailed skimmer (Orthetrum cancellatum) undergoes transition and becomes an adult dragonfly in the process known as incomplete metamorphosis. Photo from Vejlerne, northern Denmark in June.
    9629-D.jpg
  • A nymph of the black-tailed skimmer (Orthetrum cancellatum) undergoes transition and becomes an adult dragonfly in the process known as incomplete metamorphosis. Photo from Vejlerne, northern Denmark in June.
    9630-D.jpg
  • A nymph of the black-tailed skimmer (Orthetrum cancellatum) undergoes transition and becomes an adult dragonfly in the process known as incomplete metamorphosis. A second nymph, not yet started the transition, is seen in the foreghround. Photo from Vejlerne, northern Denmark in June.
    9636-D.jpg
  • A nymph of the black-tailed skimmer (Orthetrum cancellatum) undergoes transition and becomes an adult dragonfly in the process known as incomplete metamorphosis. A second nymph, not yet started the transition, is seen in the foreghround. Photo from Vejlerne, northern Denmark in June.
    9634-D.jpg
  • A nymph of the black-tailed skimmer (Orthetrum cancellatum) undergoes transition and becomes an adult dragonfly in the process known as incomplete metamorphosis. Photo from Vejlerne, northern Denmark in June.
    9633-D.jpg
  • A nymph of the black-tailed skimmer (Orthetrum cancellatum) undergoes transition and becomes an adult dragonfly in the process known as incomplete metamorphosis. A second nymph, not yet started the transition, is seen in the foreghround. Photo from Vejlerne, northern Denmark in June.
    9638-D.jpg
  • A nymph of the black-tailed skimmer (Orthetrum cancellatum) undergoes transition and becomes an adult dragonfly in the process known as incomplete metamorphosis. Photo from Vejlerne, northern Denmark in June.
    9637-D.jpg
  • Diploid sporophyte grows from the haploid gametophyte in the fern Polypodium vulgare.  Grown in culture from material collected in south-western Norway.
    17160-D.jpg
  • Colony of chinstrap penguins (Pygoscelis antarctica) at Astrolabe Island, the Antarctic Peninsula.
    150093-D.jpg
  • Mating behaviour among a pair of South Polar Skua (Stercorarius maccormicki) at PenguinjIsland, South Shetland Islands, Antarctica.
    44156-D.jpg
  • South Polar Skua (Stercorarius maccormicki) mating at Penguinj Island, South Shetland Islands, Antarctica.
    44155-D.jpg
  • Pair of lions (Panthera leo) mating in Kruger NP, South Africa.
    56580-D.jpg
  • Mother and subadult Kittiwakes (Rissa tridactyla) on their nest in the bird cliff at Bulbjerg, northern Jylland, Denmark.
    43910-D.jpg
  • House sparrow (Passer domesticus), female feeding a large chick. Photo from Hidra, south-western Norway.
    43804-D.jpg
  • Mating pair of Indian Wild Buffalos (Bulbalus arnee) in Kaziranga National Park, Assam, north-east India.
    56152-D.jpg
  • Pair of the wingless pyrgomorph grasshopper Omura congrua mating in the rainforest of La Selva, Ecuador.
    9572-D.jpg
  • Pair of the pyrgomorph grasshopper Omura congrua mating in the rainforest of La Selva, Ecuador.
    9571-D.jpg
  • African monarch (Danaus chrysippus) mating. Photo from Berenty, southern Madagascar.
    9523-D.jpg
  • Lions mating in Maasai Mara, Kenya. Nikon D500, 200-400mm @ 200mm (300mm in full frame), f4, 1/500sec, ISO800, Aperture priority
    Lions mating (55914-D).jpg
  • Adult and subadult king penguins (Aptenodytes patagonicus) from Volunteer Point, the Falklands.
    43438-D.jpg
  • Subadult king penguin (Aptenodytes patagonicus) molting at Volunteer Point, the Falklands.
    43440-D.jpg
  • Breeding colony of King Penguins (Aptenodytes patagonicus patagonicus) at Volunteer Point, the Falklands.
    43441-D.jpg
  • Family of Upland Geese (Chloephaga picta) from Torres del Paine National Park, Chile
    43427-D.jpg
  • Gentoo penguin (Pygoscelis papua) with it's off-spring at Sea Lion Island, the Falklands.
    43393-D.jpg
  • Gentoo penguin (Pygoscelis papua) feeding its chicks at Sea Lion Island, the Falklands.
    43390-D.jpg
  • Gentoo penguin (Pygoscelis papua) feeding its chicks at Sea Lion Island, the Falklands.
    43387-D.jpg
  • Juvenile king penguin (Aptenodytes patagonicus patagonicus) from The Neck, Saunders Island, the Falklands.
    43377-D.jpg
  • Female Raft spider (Dolomedes fimbriatus) carrying her off-springs. Photo from Hidra, south-western Norway.
    113034-D.jpg
  • Females common Eider (Somateria mollissima) and their chickens. Photo from south-western Norway.
    43351-D.jpg
  • Gentoo penguin (Pygoscelis papua) with it's off-spring at Saunders Island, the Falklands.
    43320-D.jpg
  • Gentoo penguin (Pygoscelis papua) with it's off-spring at Saunders Island, the Falklands.
    43317-D.jpg
  • Colonies of southern rockhopper penguins mixed with blue-eyed shags at Saunders Island, the Falklands.
    43314-D.jpg
  • Nest and eggs from the common blackbird (Turdus merula) from Hidra, south-western Norway in May.
    43312-D.jpg
  • Breeding black-browed Albatross (Thalassarche melanophrys), Saunders Island, the Falklands.
    43292-D.jpg
  • Southern rockhopper penguin (Eudyptes chrysocome) feeding it's newly hatched chick at Sounders Island, the Falkland Islands
    43298-D.jpg
  • Breeding magellanic penguins (Sphreniscus magellanicus) outside their burrows at Saunders Island, the Falkland Islands.
    43274-D.jpg
  • Breeding magellanic penguins (Sphreniscus magellanicus) outside their burrows at Saunders Island, the Falkland Islands.
    43275-D.jpg
  • Harlequin Tree Frogs (Rhacophorus pardalis) spawn in Kubah National Park, Sarawak, Borneo
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  • Egg capsules of Small-spotted Catshark (Scyliorhinus canicula) with hatching juveniles sharks.
    35153-D.jpg
  • Ovary with ovarian follicles clearly visible.
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  • Growth of red calcareous algae, tiny green algae, diatoms and blue-green bacteria as seen through a microscope. FOV is about 0,3x0,2mm.
    17130-D.jpg
  • Sexual reproduction among two dinoflagellates (Diplopsalis sp.?), sample collected from a marine aquarium.
    17154-D.jpg
  • Couple of Harpacticoid Copepods.
    17059-D.jpg
  • The eyes of a common toad, Bufo bufo.
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  • Egglaying Toads (Bufo bufo). The larger female lies the eggs in jelly-like strains while the smaller male clings to its back while fertilizing the eggs. From southern-Norway in late March.
    3514-D.jpg
  • Fighting for the female and the right to spawn among the common toad (Bufo bufo). Southern Norway, in late March.
    3512-D.jpg
  • Mother and new born Thomson Gazelle in Maasai Mara, Kenya.
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  • Pair of Galapagos Penguins (Spheniscus mendiculus) mating on the island of Santiago
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  • Northern Gannets (Morus bassanus) nesting in a large bird cliff at the island of Runde, north-western Norway.
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  • Northern Gannets (Morus bassanus) nesting in a large bird cliff at the island of Runde, north-western Norway.
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  • Northern Gannets, Morus bassanus, nesting in a large bird cliff at the island of Runbde, north-western Norway.  Do note how the birds have built their colorful nests from fishing nets gathered from the ocean.
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Alf J. Nilsen Natural History images

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