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  • Ovary with ovarian follicles clearly visible.
    17035-D.jpg
  • Juvenile sand martins (Riparia riparia) in their nest burrows. Photo from south-western Norway in August.
    44746-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 lions in Nairobi NP, Kenya.
    55331-D.jpg
  • Sand martins (Riparia riparia) at their nest burrow. Photo from south-western Norway in August.
    44744-D.jpg
  • Variable damselflies (Coenagrion pulchellum) laying eggs at vejlerne, northern Denmark.
    9621-D.jpg
  • South Polar Skua (Stercorarius maccormicki) mating at Penguinj Island, South Shetland Islands, Antarctica.
    44157-D.jpg
  • Gray langur family in Pench National Park, Madhya Pradesh, India.
    56205-D.jpg
  • Pair of gray langur (Semnopithecus dussumieri) with new-born in Pench National Park, Madhya Pradesh, India.
    56193-D.jpg
  • Southern rockhopper (Eudyptes chrysocome) nests at Saunders Island, the Falkland Islands.
    43301-D.jpg
  • Tired mating pair of lions in Nairobi National Park, Kenya.
    55276-D.jpg
  • Barn Swallow (Hirundo rustica rustica) feeding the offspring.
    41568-D.jpg
  • Colony of chinstrap penguins (Pygoscelis antarctica) at Astrolabe Island, the Antarctic Peninsula.
    44185-D.jpg
  • Female Olive baboon (Papio anubis) with recently born baby. Photo from Maasai Mara, Kenya.
    56113-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
  • 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
  • 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
  • Gray langur (Semnopithecus dussumieri) with new-born in Pench National Park, Madhya Pradesh, India.
    56192-D.jpg
  • Embryo with yolk sac from the velvet belly lanternshark (Etmopterus spinax).
    35413-D.jpg
  • Adult and subadult king penguins (Aptenodytes patagonicus) from Volunteer Point, the Falklands.
    43438-D.jpg
  • Imperial shag (Phalacrocorax atriceps) nesting at Saunders Island, the Falkland Islands
    43286-D.jpg
  • Breeding magellanic penguins (Sphreniscus magellanicus) outside their burrows at Saunders Island, the Falkland Islands.
    43274-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
  • Gray langur (Semnopithecus dussumieri) with new-born in Pench National Park, Madhya Pradesh, India.
    56204-D.jpg
  • Two embryos with yolk sacs from the velvet belly lanternshark (Etmopterus spinax)
    35412-D.jpg
  • Pregnant zommon zebra (Equus quagga) from Samburu National Reserve, Kenya.
    55859-D.jpg
  • Mating lions in Nairobi NP, Kenya.
    55332-D.jpg
  • Mating lions in Nairobi NP, Kenya.
    55333-D.jpg
  • Mating lions in Nairobi NP, Kenya.
    55334-D.jpg
  • Juvenile sand martins (Riparia riparia) in their nest burrows. Photo from south-western Norway in August.
    44747-D.jpg
  • Mating lions in Nairobi NP, Kenya.
    55335-D.jpg
  • Large katydid laying eggs on a tree trunk in the rainforest of Tanjung Puting National Park, Kalimantan, Borneo, Indonesia.
    9717-D.jpg
  • South Polar Skua (Stercorarius maccormicki) mating at Penguinj Island, South Shetland Islands, Antarctica.
    44155-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.
    43300-D.jpg
  • Imperial shag (Phalacrocorax atriceps) nesting at Saunders Island, the Falkland Islands
    43289-D.jpg
  • Mating pair of lions in Nairobi National Park, Kenya.
    55275-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.
    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.
    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
  • Pair of gray langur (Semnopithecus dussumieri) with new-born in Pench National Park, Madhya Pradesh, India.
    56194-D.jpg
  • African monarch (Danaus chrysippus) mating. Photo from Berenty, southern Madagascar.
    9523-D.jpg
  • Subadult king penguin (Aptenodytes patagonicus) molting at Volunteer Point, the Falklands.
    43440-D.jpg
  • Mating lions in Nairobi NP, Kenya.
    55330-D.jpg
  • Great Black-backed Gull (Larus marinus) nesting. Photo from Hidra, south-western Norway in early May.
    44634-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
  • Southern rockhopper (Eudyptes chrysocome) nests at Saunders Island, the Falkland Islands.
    43302-D.jpg
  • Imperial shag (Phalacrocorax atriceps) nesting at Saunders Island, the Falkland Islands
    43285-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.
    44636-D.jpg
  • Mating behaviour among a pair of South Polar Skua (Stercorarius maccormicki) at PenguinjIsland, South Shetland Islands, Antarctica.
    44156-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.
    43439-D.jpg
  • Juvenile king penguin (Aptenodytes patagonicus patagonicus) from The Neck, Saunders Island, the Falklands.
    43377-D.jpg
  • Breeding black-browed Albatross (Thalassarche melanophrys), Saunders Island, the Falklands.
    43292-D.jpg
  • Pair of imperial shags (Phalacrocorax atriceps) nesting at Saunders Island, the Falkland Islands
    43288-D.jpg
  • Imperial shag (Phalacrocorax atriceps) nesting at Saunders Island, the Falkland Islands
    43287-D.jpg
  • Breeding magellanic penguins (Sphreniscus magellanicus) outside their burrows at Saunders Island, the Falkland Islands.
    43275-D.jpg
  • Mating pair of lions in Nairobi National Park, Kenya.
    55329-D.jpg
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Alf J. Nilsen Natural History images

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