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  • New zooids formin as the colony of sea squirts (Pycnoclavella sp.?) replicates. Aquariumphoto
    10122.jpg
  • 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 lions in Nairobi NP, Kenya.
    55332-D.jpg
  • Mating pair of lions in Nairobi National Park, Kenya.
    55275-D.jpg
  • Tired mating pair of lions in Nairobi National Park, Kenya.
    55276-D.jpg
  • Mating lions in Nairobi NP, Kenya.
    55333-D.jpg
  • Mating pair of lions in Nairobi National Park, Kenya.
    55329-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.
    9611-D.jpg
  • Pair of yellow-banded conops (Conops quadrifasciatus) mating. Photo from southern Norway ina August.
    9610-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
  • Mating pair of Indian Wild Buffalos (Bulbalus arnee) in Kaziranga National Park, Assam, north-east India.
    56152-D.jpg
  • 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
  • Colony of chinstrap penguins (Pygoscelis antarctica) at Astrolabe Island, the Antarctic Peninsula.
    150093-D.jpg
  • Family of Upland Geese (Chloephaga picta) from Torres del Paine National Park, Chile
    43427-D.jpg
  • Red-footed Booby (Sula sula) nesting at Genovesa, Galapagos.
    44839-D.jpg
  • Sand martins (Riparia riparia) at their nest burrow. Photo from south-western Norway in August.
    44744-D.jpg
  • Female shelduck (Tadorna tadorna) with chicks. Photo from Vejlerne, northern Denmark in June.
    44993-D.jpg
  • White morth of Red-footed Booby (Sula sula) nesting at Genovesa, Galapagos.
    44819-D.jpg
  • Hidra, Agder, south-western Norway. Nikon D500, 600mm (900mm in full frame), f4, 1/400sec, ISO640, Manual modus.
    Growing up (44636-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
  • House sparrow (Passer domesticus), female feeding a large chick. Photo from Hidra, south-western Norway.
    43804-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
  • Breeding magellanic penguins (Sphreniscus magellanicus) outside their burrows at Saunders Island, the Falkland Islands.
    43274-D.jpg
  • The eyes of a common toad, Bufo bufo.
    3489-D.jpg
  • A pair of Green Sea Turtles (Chelonia mydas) mate off Espumilla Beach, James Bay, Santiago Island, Galapagos.
    3987-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
  • Female Olive baboon (Papio anubis) with recently born baby. Photo from Maasai Mara, Kenya.
    56113-D.jpg
  • Breeding magellanic penguins (Sphreniscus magellanicus) outside their burrows at Saunders Island, the Falkland Islands.
    43273-D.jpg
  • Juvenile sand martins (Riparia riparia) in their nest burrows. Photo from south-western Norway in August.
    44746-D.jpg
  • Female of a newly transformed black-tailed skimmer (Orthetrum cancellatum) from Vejlerne, northern Denmark in June.
    9640-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
  • 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
  • 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
  • Breeding colony of King Penguins (Aptenodytes patagonicus patagonicus) at Volunteer Point, the Falklands.
    43441-D.jpg
  • Egg capsules of Small-spotted Catshark (Scyliorhinus canicula) with hatching juveniles sharks.
    35153-D.jpg
  • 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
  • Couple of Harpacticoid Copepods.
    17059-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
  • 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.
    41532-D.jpg
  • Barn Swallow (Hirundo rustica rustica) feeding the offspring.
    41568-D.jpg
  • Red-footed Booby (Sula sula) nesting at Genovesa, Galapagos.
    44821-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.
    9643-D.jpg
  • The nymph and a newly hatched female specimen of the black-tailed skimmer (Orthetrum cancellatum). The dragonfly has just completed transition and has emerged as an adult dragonfly in the process known as incomplete metamorphosis. Photo from Vejlerne, northern Denmark in June.
    9641-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.
    9626-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.
    9631-D.jpg
  • South Polar Skua (Stercorarius maccormicki) mating at Penguinj Island, South Shetland Islands, Antarctica.
    44157-D.jpg
  • Gentoo penguin (Pygoscelis papua) feeding its chicks at Sea Lion Island, the Falklands.
    43389-D.jpg
  • Gentoo penguin (Pygoscelis papua) feeding its chicks at Sea Lion Island, the Falklands.
    43388-D.jpg
  • Colonies of southern rockhopper penguins mixed with blue-eyed shags at Saunders Island, the Falklands.
    43313-D.jpg
  • Airplane grasshoppers, Eumastax vittata, mating. Photo from La Selva, Ecuador.
    9413-D.jpg
  • Couple of Harpacticoid Copepods.
    17060-D.jpg
  • Different stages of developing seeds in Red mangrove (Rhiziophra mangle) from Darwin Bay, Genovesa, Galapagos.
    15030-D.jpg
  • Pair of Common toads ready to spawn. Photo from south-western Norway in late March 2012.
    3488-D.jpg
  • Fighting for the female and the right to spawn among the common toad (Bufo bufo). Southern Norway, in late March.
    3513-D.jpg
  • 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.
    41534-D.jpg
  • A pair of jabiru storks (Jabiru mycteria) nesting in Porto Jofre, Mato Grosso, Brazil.
    43001-D.jpg
  • Red-footed Booby (Sula sula) nesting at Genovesa, Galapagos.
    44833-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
  • Male house sparrow (Passer domesticus) feeding a large chick.  South-western Norway in mid May.
    44671-D.jpg
  • Great Black-backed Gull (Larus marinus) nesting. Photo from Hidra, south-western Norway in early May.
    44634-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.
    9632-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
  • Female Raft spider (Dolomedes fimbriatus) carrying her off-springs.  Photo from Hidra, south-western Norway.
    113010-D.jpg
  • Gentoo penguin (Pygoscelis papua) with it's off-spring at Saunders Island, the Falklands.
    43320-D.jpg
  • Gentoo penguin (Pygoscelis papua) feeding its juveniles at Saunders Island, the Falklands.
    43318-D.jpg
  • Couple of Harpacticoid Copepods.
    17061-D.jpg
  • Couple of Harpacticoid Copepods.
    17062-D.jpg
  • Mother and new born Thomson Gazelle in Maasai Mara, Kenya.
    55286-D.jpg
  • Jabiru stork (Jabiru mycteria) with three chicks in the nest. Araras Ecolodge, Pantanal, Brazil.
    43010-D.jpg
  • A pair of Green Sea Turtles (Chelonia mydas) mate off Espumilla Beach, James Bay, Santiago Island, Galapagos.
    3986-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
  • 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 pair of rhesus macaques (Macaca mulatta) mate in the tree tops. Photo from Kaziranga National Park, Assam, north-east India.
    56179-D.jpg
  • African monarch (Danaus chrysippus) mating. Photo from Berenty, southern Madagascar.
    9523-D.jpg
  • Maasai Mara, Kenya. Nikon D500, 200-400mm @ 200mm (300mm in full frame), f4, 1/500sec, ISO800, Aperture priority
    Lions mating (55914-D).jpg
  • Family of Upland Geese (Chloephaga picta) from Sea Lion Island, the Falklands.
    43334-D.jpg
  • Colony of black-browed albatross (Thalassarche melanophrys) nesting at Saunders Island (close to Rockery cabin), the Falkland Islands.
    43315-D.jpg
  • Mating pair of Gentoo Penguins (Pygoscelis papua) at Elephant Point, South Shetland Islands, Antarctica
    43144-D.jpg
  • Seven-spotted Ladybird, Coccinella septempunctata, mating.
    9380-D.jpg
  • Female spotted deer (Axis axis) cleaning a new-born, deer. Tadoba NP, India.
    55707-D.jpg
  • Northern Gannets (Morus bassanus) nesting in a large bird cliff at the island of Runde, north-western Norway.
    41542-D.jpg
  • Large katydid laying eggs on a tree trunk in the rainforest of Tanjung Puting National Park, Kalimantan, Borneo, Indonesia.
    9717-D.jpg
  • Male flowers of scots pine (Pinus sylvestris) are releasing the pollen.
    112135-D.jpg
  • Agressive male shelduch (Tadorna tadorna) chasing off the female and protecting the chicks.
    44994-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.
    9635-D.jpg
  • Craneflies (family Tipulidae) mating. Photo from Andasibe, Madagascar.
    9547-D.jpg
  • Adult and subadult king penguins (Aptenodytes patagonicus) from Volunteer Point, the Falklands.
    43438-D.jpg
  • Gentoo penguin (Pygoscelis papua) nesting at Sea Lion Island, the Falklands.
    43391-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
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Alf J. Nilsen Natural History images

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