Donald M. Jones / Black-tailed Prairie Dog (Cynomys ludovicianus) pair greeting, South Dakota
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Richard Du Toit / Burchell's Zebra (Equus burchellii) trio nuzzling, Itala Game Reserve, South Africa
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Marion Vollborn/ BIA / Tiger (Panthera tigris) female with cubs, native to Asia
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Neil Aldridge / Warthog (Phacochoerus africanus) with a Yellow-billed oxpecker (Buphagus africanus) on its back, nuzzling its mother at a waterhole, Chief's Island, Okavango Delta, Botswana.
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Tony Wu / Humpback whale (Megaptera novaeangliae) calf nuzzling its mother, Vava'u, Kingdom of Tonga, Pacific Ocean.
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Richard Du Toit / Burchell's Zebra (Equus burchellii) pair nuzzling, Rietvlei Nature Reserve, South Africa
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Richard Du Toit / Burchell's Zebra (Equus burchellii) females nuzzling, Rietvlei Nature Reserve, South Africa
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Richard Du Toit / African Lion (Panthera leo) males greeting, Kgalagadi Transfrontier Park, South Africa
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Richard Du Toit / Burchell's Zebra (Equus burchellii) parents tending to foal, Rietvlei Nature Reserve, South Africa