Stefan Christmann / Emperor penguin (Aptenodytes forsteri) chick aged six to eight weeks near adult's feet. Atka Bay, Antarctica. September.

Pete Oxford / Konyak Naga tattooed head hunter. Only someone who has killed and taken a human head can be tattooed in this manner. Mon district. Nagaland, North East India, October 2014.

Pete Oxford / Konyak Naga tattooed Ang or Chief. Only someone who has killed and taken a human head can be tattooed in this manner. Mon district. Nagaland, North East India, October 2014.

Pete Oxford / Konyak Naga tattooed Ang or Chief. Only someone who has killed and taken a human head can be tattooed in this manner. Mon district. Nagaland, North East India, October 2014.

Enrique Lopez-Tapia / Woman with stick at the Jumping of the bulls Hamer ceremony. This Hamer ceremony, is a right of passage into manhood for Hamer boys. During the ceremony young female relatives of the boys beg to be wh...

Enrique Lopez-Tapia / Hamer women in traditional clothing at the Jumping of the bulls ceremony. Ethiopia, November 2014

Rick Price / Eastern osprey (Pandion cristatus) juvenile practicing flight around nest. Bigge Island, Bonaparte Archipelago, The Kimberley, Western Australia.

Jack Dykinga / Burrowing owl (Athene cunicularia) fledgling aged one month testing wings in flight whilst playing with stick. Marana, Arizona, USA. May.

Jack Dykinga / Burrowing owl (Athene cunicularia) fledgling aged one month, flying. Marana, Arizona, USA. May.

Jack Dykinga / Burrowing owl (Athene cunicularia) fledgling testing wings in flight with siblings observing. Aged one month. Marana, Arizona, USA. May.

Jack Dykinga / Burrowing owl (Athene cunicularia), two fledglings aged one month, one testing wings in flight. Marana, Arizona, USA. May.

Jack Dykinga / Burrowing owl (Athene cunicularia), two fledglings aged one month, one testing wings in flight above sibling. Marana, Arizona, USA. May.

Jack Dykinga / Burrowing owl (Athene cunicularia), two chicks testing wings, aged a few weeks. Marana, Arizona, USA. May.

Steven David Miller / Agile wallaby (Macropus agilis) female cleaning herself with joey squeezed into pouch. Nitmiluk National Park, Northern Territory, Australia.

Steven David Miller / Agile wallaby (Macropus agilis) female with joey in pouch, joey's limbs no longer fit in pouch. Nitmiluk National Park, Northern Territory, Australia.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) adults and fledglings aged 20-24 weeks diving into sea. Atka Bay, Antarctica. January 2017. Winner of the Portfolio category of the Wildlife Photographer of the...

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) adults and fledglings aged 20-24 weeks diving into sea. Atka Bay, Antarctica. January 2017.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) adults and fledglings aged 20-24 weeks diving into sea. Atka Bay, Antarctica. January 2017.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) adults and fledglings aged 20-24 weeks diving into sea. Atka Bay, Antarctica. January 2017.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) chick aged six to eight weeks, alone on sea ice. Atka Bay, Antarctica. September.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) with chick aged 6-8 weeks. Chick soon to be left on sea ice while both parents fish at sea. Atka Bay, Antarctica. September.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) standing with chick. Atka Bay, Antarctica. September.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) chick aged two months alone on sea ice whilst parents fish. Atka Bay, Antarctica. September.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) chick aged eight weeks attempting to shelter under adult. Atka Bay, Antarctica. September.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) aged six to eight weeks alone on sea ice whilst parents fish at sea. Atka Bay, Antarctica. September.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) aged six to eight weeks alone on sea ice whilst parents fish at sea. Atka Bay, Antarctica. September.

Sven Zacek / Ural owl (Strix uralensis) nestling at top of nest site preparing to jump and fledge nest. Tartumaa, Southern Estonia. May.

Enrique Lopez-Tapia / Men watching the Jumping of the bulls Hamer ceremony, an right of passage for young Hamer boys. Ethiopia, November 2014

Enrique Lopez-Tapia / Group of women at the Jumping of the bulls Hamer ceremony. This Hamer ceremony is a a right of passage into manhood for Hamer boys. Ethiopia, November 2014

Enrique Lopez-Tapia / Women dancing at the Jumping of the bulls Hamer ceremony. This Hamer ceremony is a a right of passage into manhood for Hamer boys. During the ceremony young female relatives of the boys beg to be whip...

Enrique Lopez-Tapia / Women dancing at the Jumping of the bulls Hamer ceremony. This Hamer ceremony is a a right of passage into manhood for Hamer boys. During the ceremony young female relatives of the boys beg to be whip...

Enrique Lopez-Tapia / Man at the Jumping of the bulls Hamer ceremony. This Hamer ceremony is a a right of passage into manhood for Hamer boys. Ethiopia, November 2014

Enrique Lopez-Tapia / Castrated Zebu bulls which will be used in the Hamer Jumping of the bulls ceremony. This Hamer ceremony is a a right of passage into manhood for all young Hamer. Each naked boy taking part must leap d...

Enrique Lopez-Tapia / Women dancing at the Jumping of the bulls Hamer ceremony. This Hamer ceremony is a a right of passage into manhood for Hamer boys. During the ceremony young female relatives of the boys beg to be whip...

Enrique Lopez-Tapia / Women dancing at the Jumping of the bulls Hamer ceremony. This Hamer ceremony, it's a right of passage into manhood for Hamer boys. During the ceremony young female relatives of the boys beg to be whi...

Enrique Lopez-Tapia / Women dancing at the Jumping of the bulls Hamer ceremony. This Hamer ceremony is a a right of passage into manhood for Hamer boys. During the ceremony young female relatives of the boys beg to be whip...

Enrique Lopez-Tapia / Women dancing and playing horns at the Jumping of the bulls Hamer ceremony. This Hamer ceremony is a a right of passage into manhood for Hamer boys. During the ceremony young female relatives of the b...

Enrique Lopez-Tapia / Women dancing and playing horns at the Jumping of the bulls Hamer ceremony. This hamer ceremony, is a right of passage into manhood for Hamer boys. During the ceremony young female relatives of the bo...

Enrique Lopez-Tapia / Women dancing and playing horns at the Jumping of the bulls Hamer ceremony, with tourists watching behind. This Hamer ceremony is a a right of passage into manhood for Hamer boys. During the ceremony...

Enrique Lopez-Tapia / Bulls lined up ready for the Jumping of the Bulls Hamer ceremony, where naked boys will leap along the backs of the bulls as aright of passage into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Women dancing at the Jumping of the bulls Hamer ceremony, with tourists watching behind. This Hamer ceremony, is a right of passage into manhood for Hamer boys. During the ceremony young female relati...

Enrique Lopez-Tapia / Men with sticks to beat young women at the Jumping of the Bulls Hamer ceremony, where naked boys will leap along the backs of the bulls as aright of passage into manhood. During the ceremony young fem...

Enrique Lopez-Tapia / Men lining up bulls for the Jumping of the Bulls Hamer ceremony, where naked boys will leap along the backs of the bulls as aright of passage into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Men lining up bulls for the Jumping of the Bulls Hamer ceremony, where naked boys will leap along the backs of the bulls as aright of passage into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Men lining up bulls for the Jumping of the Bulls Hamer ceremony, where naked boys will leap along the backs of the bulls as aright of passage into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Men lining up bulls for the Jumping of the Bulls Hamer ceremony, where naked boys will leap along the backs of the bulls as aright of passage into manhood. Tourists watching in the background. Ethiopi...

Enrique Lopez-Tapia / Men lining up bulls for the Jumping of the Bulls Hamer ceremony, where naked boys will leap along the backs of the bulls as aright of passage into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Men lining up bulls for the Jumping of the Bulls Hamer ceremony, where naked boys will leap along the backs of the bulls as aright of passage into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Naked Hamer boy ready to leap across line of bulls, as part of the Jumping of the Bulls ceremony which marks the transition into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Naked Hamer boy ready to leap across line of bulls, as part of the Jumping of the Bulls ceremony which marks the transition into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Scars on back of woman whipped during Hamer Jumping of the Bulls ceremony. This Hamer ceremony is a a right of passage into manhood for all young Hamer. Each naked boy taking part must leap down the l...

Enrique Lopez-Tapia / Jumping of the bulls Hamer ceremony. This Hamer ceremony is a a right of passage into manhood for all young Hamer. Each naked boy taking part must leap down the line of bulls, jumping on the animals f...

Enrique Lopez-Tapia / Jumping of the bulls Hamer ceremony. This Hamer ceremony is a a right of passage into manhood for all young Hamer. Each naked boy taking part must leap down the line of bulls, jumping on the animals f...

Enrique Lopez-Tapia / Men with sticks to beat young women at the Jumping of the Bulls Hamer ceremony, where naked boys will leap along the backs of the bulls as aright of passage into manhood. During the ceremony young fem...

Enrique Lopez-Tapia / Naked Hamer boy ready to leap across line of bulls, as part of the Jumping of the Bulls ceremony which marks the transition into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Naked Hamer boy ready to leap across line of bulls, as part of the Jumping of the Bulls ceremony which marks the transition into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Men lining up bulls for the Jumping of the Bulls Hamer ceremony, where naked boys will leap along the backs of the bulls as aright of passage into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Men lining up bulls for the Jumping of the Bulls Hamer ceremony, where naked boys will leap along the backs of the bulls as aright of passage into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Men lining up bulls for the Jumping of the Bulls Hamer ceremony, where naked boys will leap along the backs of the bulls as aright of passage into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Men lining up bulls for the Jumping of the Bulls Hamer ceremony, where naked boys will leap along the backs of the bulls as aright of passage into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Naked Hamer boy leaping across line of bulls, as part of the Jumping of the Bulls ceremony which marks the transition into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Naked Hamer boy leaping across line of bulls, as part of the Jumping of the Bulls ceremony which marks the transition into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Naked Hamer boy leaping across line of bulls, as part of the Jumping of the Bulls ceremony which marks the transition into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Naked Hamer boy leaping across line of bulls, as part of the Jumping of the Bulls ceremony which marks the transition into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Naked Hamer boy leaping across line of bulls, as part of the Jumping of the Bulls ceremony which marks the transition into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Naked Hamer boy leaping across line of bulls, as part of the Jumping of the Bulls ceremony which marks the transition into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Naked Hamer boy leaping across line of bulls, as part of the Jumping of the Bulls ceremony which marks the transition into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Naked Hamer boy leaping across line of bulls, as part of the Jumping of the Bulls ceremony which marks the transition into manhood. Ethiopia, November 2014

Enrique Lopez-Tapia / Naked Hamer boy leaping across line of bulls, as part of the Jumping of the Bulls ceremony which marks the transition into manhood. Ethiopia, November 2014

Steve O. Taylor (GHF) / Mbuti Pygmy boys in traditional blue body paint and straw skirts, on way to forest to undergo initiation ceremony, which is a right of passage into manhood. Ituri Rainforest, Democratic Republic of th...

Steve O. Taylor (GHF) / Mbuti Pygmy boys in traditional blue body paint and straw skirts, on way to forest to undergo initiation ceremony, which is a right of passage into manhood. Ituri Rainforest, Democratic Republic of th...

Steve O. Taylor (GHF) / Mbuti Pygmy boys in traditional blue body paint and straw skirts, on way to forest to undergo initiation ceremony, which is a right of passage into manhood. Ituri Rainforest, Democratic Republic of th...

Steve O. Taylor (GHF) / Mbuti Pygmy boys in traditional blue body paint and straw skirts, on way to forest to undergo initiation ceremony, which is a right of passage into manhood. Ituri Rainforest, Democratic Republic of th...

Steve O. Taylor (GHF) / Mbuti Pygmy boys in traditional blue body paint and straw skirts, on way to forest to undergo initiation ceremony, which is a right of passage into manhood. Ituri Rainforest, Democratic Republic of th...

Steve O. Taylor (GHF) / Mbuti Pygmy boys in traditional blue body paint and straw skirts, on way to forest to undergo initiation ceremony, which is a right of passage into manhood. Ituri Rainforest, Democratic Republic of th...

Steve O. Taylor (GHF) / Mbuti Pygmy boys in traditional blue body paint and straw skirts, on way to forest to undergo initiation ceremony, which is a right of passage into manhood. Ituri Rainforest, Democratic Republic of th...

Steve O. Taylor (GHF) / Mbuti Pygmy boys in traditional blue body paint and straw skirts, on way to forest to undergo initiation ceremony, which is a right of passage into manhood. Ituri Rainforest, Democratic Republic of th...

Steve O. Taylor (GHF) / Mbuti Pygmy boys in traditional blue body paint and straw skirts, on way to forest to undergo initiation ceremony, which is a right of passage into manhood. Ituri Rainforest, Democratic Republic of th...

Steve O. Taylor (GHF) / Mbuti Pygmy boys in traditional blue body paint and straw skirts, on way to forest to undergo initiation ceremony, which is a right of passage into manhood. Ituri Rainforest, Democratic Republic of th...

Steve O. Taylor (GHF) / Mbuti pygmy initiation hunt, with two boys in traditional blue body paint and straw skirt. One boy is holding catch of Blue Duiker (Philantomba monticola). Ituri Rainforest, Democratic Republic of Con...

Steve O. Taylor (GHF) / Mbuti pygmy initiation hunt, with two boys in traditional blue body paint and straw skirt. One boy is holding catch of Blue Duiker (Philantomba monticola). Ituri Rainforest, Democratic Republic of Con...

Steve O. Taylor (GHF) / Mbuti pygmy initiation hunt, with two boys in traditional blue body paint and straw skirt. One boy is holding catch of Blue Duiker (Philantomba monticola). As well as using bows and arrows in this hun...

Steve O. Taylor (GHF) / Mbuti pygmy initiation hunt, with two boys in traditional blue body paint and straw skirt. One boy is holding catch of Blue Duiker (Philantomba monticola) Ituri Rainforest, Democratic Republic of the...

Steve O. Taylor (GHF) / Mbuti pygmy initiation hunt, with two boys in traditional blue body paint and straw skirt. One boy is holding catch of Blue Duiker (Philantomba monticola) Ituri Rainforest, Democratic Republic of the...

Steve O. Taylor (GHF) / Mbuti pygmy initiation hunt, with two boys in traditional blue body paint and straw skirt. One boy is holding catch of Blue Duiker (Philantomba monticola) Ituri Rainforest, Democratic Republic of the...

Steve O. Taylor (GHF) / Mbuti pygmy initiation hunt, with two boys in traditional blue body paint and straw skirt. One boy is holding catch of Blue Duiker (Philantomba monticola) Ituri Rainforest, Democratic Republic of the...

Steve O. Taylor (GHF) / Mbuti Pygmy men resting and looking around whilst hunting, Ituri Rainforest, Democratic Republic of the Congo, Africa, November 2011.

Rose Summers / Slow motion shot of Common kestrel (Falco tinnunculus) chick leaving nest hole and clambering up tree trunk while it's sibling watches from the nest, Devon, England, UK, June.