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Joel Sartore Joel Sartore

National Geographic Photographer and Speaker

Keyword: horn

Photo: A double-wattled cassowary (Casuarius casuarius sclateri) at a private collection in Jakarta, Indonesia.

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A double-wattled cassowary (Casuarius casuarius sclateri) at a private collection in Jakarta, Indonesia. This animal is under the care of PT. Alam Nusantara Jayatama.

Photo: A double-wattled cassowary (Casuarius casuarius sclateri) at a private collection in Jakarta, Indonesia.

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A double-wattled cassowary (Casuarius casuarius sclateri) at a private collection in Jakarta, Indonesia. This animal is under the care of PT. Alam Nusantara Jayatama.

Photo: A double-wattled cassowary (Casuarius casuarius sclateri) at a private collection in Jakarta, Indonesia.

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A double-wattled cassowary (Casuarius casuarius sclateri) at a private collection in Jakarta, Indonesia. This animal is under the care of PT. Alam Nusantara Jayatama.

A pronghorn (Antilocapra americana) crossing under a fence near Medicine Hat, Alberta, Canada.

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A pronghorn (Antilocapra americana) crossing under a fence near Medicine Hat, Alberta, Canada.

An endangered Indian rhinoceros female with calf (Rhinoceros unicornis) at the Fort Worth Zoo.

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An endangered Indian rhinoceros female with calf (Rhinoceros unicornis) at the Fort Worth Zoo.

Photo: A critically endangered (IUCN) and federally endangered female eastern black rhino (Diceros bicornis michaeli) named Imara at the Great Plains Zoo.

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A critically endangered (IUCN) and federally endangered female eastern black rhino (Diceros bicornis michaeli) named Imara at the Great Plains Zoo.

Photo: An endangered horned guan (Oreophasis derbianus) at the Dallas World Aquarium.

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An endangered horned guan (Oreophasis derbianus) at the Dallas World Aquarium.

Picture of a critically endangered (IUCN) and federally endangered female eastern black rhino (Diceros bicornis michaeli) named Imara at the Great Plains Zoo.

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A critically endangered (IUCN) and federally endangered female eastern black rhino (Diceros bicornis michaeli) named Imara at the Great Plains Zoo.

Picture of a critically endangered (IUCN) and a federally endangered female eastern black rhino (Diceros bicornis michaeli) named Imara at the Great Plains Zoo.

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A critically endangered (IUCN) and a federally endangered female eastern black rhino (Diceros bicornis michaeli) named Imara at the Great Plains Zoo.

A musk ox (Ovibos moschatus moschatus) at the University of Alaska in Fairbanks, AK.

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A musk ox (Ovibos moschatus moschatus) at the University of Alaska in Fairbanks, AK.

Photo: A male Luzon rufous hornbill, Buceros hydrocorax, at the Avilon Zoo. This species is listed as vulnerable on the IUCN red list.

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A male Luzon rufous hornbill, Buceros hydrocorax, at the Avilon Zoo. This species is listed as vulnerable on the IUCN red list.

Photo: A male Luzon rufous hornbill, Buceros hydrocorax, at the Avilon Zoo. This species is listed as vulnerable on the IUCN red list.

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A male Luzon rufous hornbill, Buceros hydrocorax, at the Avilon Zoo. This species is listed as vulnerable on the IUCN red list.

Photo: A male Luzon rufous hornbill, Buceros hydrocorax, at the Avilon Zoo. This species is listed as vulnerable on the IUCN red list.

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A male Luzon rufous hornbill, Buceros hydrocorax, at the Avilon Zoo. This species is listed as vulnerable on the IUCN red list.

Photo: Cliff, a male Rocky Mountain bighorn sheep (Ovis canadensis canadensis) at the Denver Zoo.

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Cliff, a male Rocky Mountain bighorn sheep (Ovis canadensis canadensis) at the Denver Zoo.

Photo: Cliff, a male Rocky Mountain bighorn sheep (Ovis canadensis canadensis) at the Denver Zoo.

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Cliff, a male Rocky Mountain bighorn sheep (Ovis canadensis canadensis) at the Denver Zoo.

Photo: Cliff, a male Rocky Mountain bighorn sheep (Ovis canadensis canadensis) at the Denver Zoo.

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Cliff, a male Rocky Mountain bighorn sheep (Ovis canadensis canadensis) at the Denver Zoo.

Photo: Kordofan aoudad or Sudan barbary sheep (Ammotragus lervia blainei) at the Dallas Zoo. This species is listed as vulnerable by the IUCN.

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Kordofan aoudad or Sudan barbary sheep (Ammotragus lervia blainei) at the Dallas Zoo. This species is listed as vulnerable by the IUCN.

Picture of Nabire, a Northern white rhinoceros (Ceratotherium simum cottoni)

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Nabire, a Northern white rhinoceros (Ceratotherium simum cottoni) was one of the last three northern white rhinos left on Earth. She died on Monday, July 27, 2015, just one week after this photo was taken at the Dvur Kralove Zoo. This species is critically endangered, and heading towards extinction.

Picture of Nabire, a Northern white rhinoceros (Ceratotherium simum cottoni)

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Nabire, a Northern white rhinoceros (Ceratotherium simum cottoni) was one of the last three northern white rhinos left on Earth. She died on Monday, July 27, 2015, just one week after this photo was taken at the Dvur Kralove Zoo. This species is critically endangered, and heading towards extinction.

Picture of Nabire, a Northern white rhinoceros (Ceratotherium simum cottoni)

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Nabire, a Northern white rhinoceros (Ceratotherium simum cottoni) was one of the last three northern white rhinos left on Earth. She died on Monday, July 27, 2015, just one week after this photo was taken at the Dvur Kralove Zoo. This species is critically endangered, and heading towards extinction.

Picture of Nabire, a Northern white rhinoceros (Ceratotherium simum cottoni)

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Nabire, a Northern white rhinoceros (Ceratotherium simum cottoni) was one of the last three northern white rhinos left on Earth. She died on Monday, July 27, 2015, just one week after this photo was taken at the Dvur Kralove Zoo. This species is critically endangered, and heading towards extinction.

Picture of Nabire, a Northern white rhinoceros (Ceratotherium simum cottoni)

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Nabire, a Northern white rhinoceros (Ceratotherium simum cottoni) was one of the last three northern white rhinos left on Earth. She died on Monday, July 27, 2015, just one week after this photo was taken at the Dvur Kralove Zoo. This species is critically endangered, and heading towards extinction.

Photo: Barasingha (Rucervus duvaucelii syn.

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Barasingha (Rucervus duvaucelii syn. Cervus duvaucelii) also called swamp deer, at the National Zoological Park New Delhi in New Delhi, India.

An endangered female O’Shaughnessy’s chameleon (Calumma oshaughnessyi) in Madagascar.

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An endangered female O’Shaughnessy’s chameleon (Calumma oshaughnessyi) in Madagascar.

Photo: A female globed-horned chameleon (Calumma globifer) in Madagascar.

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A female globed-horned chameleon (Calumma globifer) in Madagascar. This chameleon is molting or shedding her skin.

An endangered female O’Shaughnessy’s chameleon (Calumma oshaugnessyi) and a female globed-horned chameleon (Calumma globifer) in Madagascar.

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An endangered female O’Shaughnessy’s chameleon (Calumma oshaugnessyi) and a female globed-horned chameleon (Calumma globifer) in Madagascar.

Photo: A female globed-horned chameleon (Calumma globifer) in Madagascar.

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A female globed-horned chameleon (Calumma globifer) in Madagascar. This chameleon is molting or shedding her skin.

Photo: An endangered lesser chameleon (Furcifer minor) in Madagascar.

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An endangered lesser chameleon (Furcifer minor) in Madagascar.

Photo: An endangered lesser chameleon (Furcifer minor) in Madagascar.

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An endangered lesser chameleon (Furcifer minor) in Madagascar.

Photo: An endangered lesser chameleon (Furcifer minor) in Madagascar.

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An endangered lesser chameleon (Furcifer minor) in Madagascar.

Photo: A nose-horned chameleon (Calumma nasutum) in Madagascar.

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A nose-horned chameleon (Calumma nasutum) in Madagascar.

Photo: A nose-horned chameleon (Calumma nasutum) in Madagascar.

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A nose-horned chameleon (Calumma nasutum) in Madagascar.

An endangered female O’Shaughnessy’s chameleon (Calumma oshaughnessyi) in Madagascar.

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An endangered female O’Shaughnessy’s chameleon (Calumma oshaughnessyi) in Madagascar.

Photo: A Southern red muntjac (Muntiacus muntjak) at the Assam State Zoo cum Botanical Garden in Guwahati, Assam, India.

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A Southern red muntjac (Muntiacus muntjak) at the Assam State Zoo cum Botanical Garden in Guwahati, Assam, India.

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