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It’s a widespread phenomenon: cute animals pull on our heartstrings. But what is it about those big eyes and fuzzy faces that we find so irresistible? And why should an entirely different species make us go weak at the knees?

Find out in our photo feature complete with text, here.

Leopard cub with ticks in ears {Panthera pardus} Masai Mara, Kenya - Anup Shah
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Anup Shah / Leopard cub with ticks in ears {Panthera pardus} Masai Mara, Kenya
Western chimpazee (Pan troglodytes verus) infant male 'Flanle' aged 3 years playing on ground, Bossou Forest, Mont Nimba, Guinea. January 2011. - Fiona Rogers
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Fiona Rogers / Western chimpazee (Pan troglodytes verus) infant male 'Flanle' aged 3 years playing on ground, Bossou Forest, Mont Nimba, Guinea. January 2011.
Southern plains grey langur / Hanuman langur (Semnopithecus dussumieri) infant aged a few days with its mother. Jodhpur, Rajasthan, India. March. - Fiona Rogers
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Fiona Rogers / Southern plains grey langur / Hanuman langur (Semnopithecus dussumieri) infant aged a few days with its mother. Jodhpur, Rajasthan, India. March.
Lesser flamingo {Phoeniconaias minor} chick beside legs of adult, Lake Nakuru NP, Kenya - Anup Shah
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Anup Shah / Lesser flamingo {Phoeniconaias minor} chick beside legs of adult, Lake Nakuru NP, Kenya
Serval kitten (Felis / Leptailurus serval) Masai Mara National Reserve, Kenya - Anup Shah
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Anup Shah / Serval kitten (Felis / Leptailurus serval) Masai Mara National Reserve, Kenya
Bornean Orangutan (Pongo pygmaeus wurmbii) male baby 'Thor' aged 8-9 months held in his mother's arms. Camp Leakey, Tanjung Puting National Park, Central Kalimantan, Borneo, Indonesia. July 2010. Reha... - Anup Shah
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Anup Shah / Bornean Orangutan (Pongo pygmaeus wurmbii) male baby 'Thor' aged 8-9 months held in his mother's arms. Camp Leakey, Tanjung Puting National Park, Central Kalimantan, Borneo, Indonesia. July 2010. Reha...
Hippopotamus {Hippopotamus amphibius} resting with young, Masai Mara GR, Kenya - Anup Shah
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Anup Shah / Hippopotamus {Hippopotamus amphibius} resting with young, Masai Mara GR, Kenya
Liver Flatcoated Retriever puppy, 6 weeks. - Mark Taylor
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Mark Taylor / Liver Flatcoated Retriever puppy, 6 weeks.
Two baby African elephants with trunks entwined. Masai Mara, Kenya - Anup Shah
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Anup Shah / Two baby African elephants with trunks entwined. Masai Mara, Kenya
Young Masai giraffe {Giraffa camelopardalis tippelski} in evening light, Masai Mara National Reserve, Kenya, East Africa - Anup Shah
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Anup Shah / Young Masai giraffe {Giraffa camelopardalis tippelski} in evening light, Masai Mara National Reserve, Kenya, East Africa
Lion (Panthera leo) cub, rolling over playfully, wide angle perspective taken with remote camera, Maasai Mara National Reserve, Kenya. August. - Anup Shah
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Anup Shah / Lion (Panthera leo) cub, rolling over playfully, wide angle perspective taken with remote camera, Maasai Mara National Reserve, Kenya. August.
African lion (Panthera leo) mature male, passing by, Masai Mara National Reserve, Kenya, March - Anup Shah
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Anup Shah / African lion (Panthera leo) mature male, passing by, Masai Mara National Reserve, Kenya, March
Warthog and young sniffing {Phacochoerus aethiopicus} Masai Mara, Kenya - Anup Shah
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Anup Shah / Warthog and young sniffing {Phacochoerus aethiopicus} Masai Mara, Kenya
Two Spotted hyaena {Crocuta crocuta} pups, Serengetti, Tanzania. - Anup Shah
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Anup Shah / Two Spotted hyaena {Crocuta crocuta} pups, Serengetti, Tanzania.
Lion-tailed macaque (Macaca silenus) infant age less than 1 month portrait . Anamalai Tiger Reserve, Western Ghats, Tamil Nadu, India. March. - Fiona Rogers
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Fiona Rogers / Lion-tailed macaque (Macaca silenus) infant age less than 1 month portrait . Anamalai Tiger Reserve, Western Ghats, Tamil Nadu, India. March.