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  • Sexual reproduction among two dinoflagellates (Diplopsalis sp.?), sample collected from a marine aquarium.
    17154-D.jpg
  • Reproduction in Spanish Slugs, Arion vulgaris. The hermafroditic specimens are exchanging sperm pcakages.
    7205-D.jpg
  • Reproduction in Spanish Slugs, Arion vulgaris. The hermafroditic specimens are exchanging sperm pcakages.
    7206-D.jpg
  • Mating pair of proboscis monkey (Nasalis larvatus) in Tanjung Puting National Park, Kalimantan, Borneo (Indonesia).
    57128-D.jpg
  • Sac-spider (fam Clubionidae?) with off-springs in web.  Komodo Island, Indonesia.
    113253-D.jpg
  • Ovary with ovarian follicles clearly visible.
    17035-D.jpg
  • Cross section through a testes with immature sperm cells clearly visible.
    17034-D.jpg
  • Agressive male shelduch (Tadorna tadorna) chasing off the female and protecting the chicks.
    44994-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.
    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.
    9628-D.jpg
  • Kittiwakes (Rissa tridactyla) nesting in the bird cliff at Bulbjerg, northern Jylland, Denmark.
    43908-D.jpg
  • Hyacinth macaw (Anodorhynchus hyacinthinus) nesting in an artifical nesting site at Araras Ecolodge, Pantanal, Brazil.
    43550-D.jpg
  • Female Olive baboon (Papio anubis) with recently born baby. Photo from Maasai Mara, Kenya.
    56113-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
  • Breeding magellanic penguins (Sphreniscus magellanicus) outside their burrows at Saunders Island, the Falkland Islands.
    43273-D.jpg
  • Pair of hyacinth macaws (Anodorhynchus hyacinthinus) nesting in an artifical nesting site at Araras Ecolodge, Pantanal, Brazil.
    43011-D.jpg
  • Puppa of Phantom Midge (family Chaoboridae). Southern Norway
    9211-D.jpg
  • Egg strains of Toads (Bufo bufo). South-western Norway in April.
    3405-D.jpg
  • White-fronted Bee-eater (Merops bullockoides) at its nesting place in a mud bank at Lake Nakuru NP., Kenya
    41281-D.jpg
  • Northern Gannets (Morus bassanus) nesting in a large bird cliff at the island of Runde, north-western Norway.
    41537-D.jpg
  • Large tadpoles of the otton frog (Babina subaspera) from the temperate forest of Amami Oshima, southern Japan.
    60058-D.jpg
  • Large tadpole of the otton frog (Babina subaspera) from the temperate forest of Amami Oshima, southern Japan.
    60057-D.jpg
  • Sword-tailed newt (Cynops ensicauda) from Amami Oshima, Japan. Do note the three juvenile salamander in the photo.
    60039-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
  • 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
  • Female shelduck (Tadorna tadorna) with chicks. Photo from Vejlerne, northern Denmark in June.
    44993-D.jpg
  • Fake mating among Thonson Gazella (Eudorcan thomsonii) in Maasai mara, Kenya.
    56728-D.jpg
  • Fighting for the female and the right to spawn among the common toad (Bufo bufo). Southern Norway, in April.
    60012-D.jpg
  • New zooids formin as the colony of sea squirts (Pycnoclavella sp.?) replicates. Aquariumphoto
    10122.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
  • 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
  • Overleaf pellia (Pellia epiphylla) with sporophytic stalks.Photo from Hidra, south-western Norway in April.
    12114-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 (Passer domesticus) feeding a large chick.  South-western Norway in mid May.
    44636-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
  • 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.
    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.
    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. Photo from Vejlerne, northern Denmark in June.
    9635-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
  • Pair of yellow-banded conops (Conops quadrifasciatus) mating. Photo from southern Norway ina August.
    9611-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
  • Antarctic cormorants ((Phalacrocorax bransfieldensis) nesting at Hydrurga Rocks, Antarctica.
    44161-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
  • Gray langur family in Pench National Park, Madhya Pradesh, India.
    56205-D.jpg
  • Pench National Park, Madhya Pradesh, India. Nikon D500, 600mm (900mm in full frame), f4, EV+0.3, 1/640sec, ISO1250, Aperture priority
    Monkey Mother (56204-D).jpg
  • Gray langur (Semnopithecus dussumieri) with new-born in Pench National Park, Madhya Pradesh, India.
    56192-D.jpg
  • Mating pair of Indian Wild Buffalos (Bulbalus arnee) in Kaziranga National Park, Assam, north-east India.
    56152-D.jpg
  • Embryo with yolk sac from the velvet belly lanternshark (Etmopterus spinax).
    35413-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
  • Craneflies (family Tipulidae) mating. Photo from Andasibe, Madagascar.
    9547-D.jpg
  • Juvenile king penguin (Aptenodytes patagonicus patagonicus) from Volunteer Point, the Falklands.
    43437-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
  • Adult and subadult king penguins (Aptenodytes patagonicus) from Volunteer Point, the Falklands.
    43439-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.
    43394-D.jpg
  • Gentoo penguin (Pygoscelis papua) with it's off-spring at Sea Lion Island, the Falklands.
    43393-D.jpg
  • Gentoo penguin (Pygoscelis papua) nesting at Sea Lion Island, the Falklands.
    43392-D.jpg
  • Gentoo penguin (Pygoscelis papua) nesting at Sea Lion Island, the Falklands.
    43391-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
  • 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
  • Southern rockhopper (Eudyptes chrysocome) nests at Saunders Island, the Falkland Islands.
    43299-D.jpg
  • Southern rockhopper (Eudyptes chrysocome) nests at Saunders Island, the Falkland Islands.
    43302-D.jpg
  • Southern rockhopper (Eudyptes chrysocome) nests at Saunders Island, the Falkland Islands.
    43300-D.jpg
  • Colony of black-browed albatross (Thalassarche melanophrys) nesting at Saunders Island (close to Rockery cabin), the Falkland Islands.
    43291-D.jpg
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Alf J. Nilsen Natural History images

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