Lion expert Dr Luke Hunter told the BBC the images are a once-in-a-lifetime sight
A baby leopard can't change his spots, but this lioness doesn't seem to mind.
These beautiful pictures are the first ever taken of a wild lioness nursing a cub from a different species - an extremely rare event.
The pair were spotted by Joop Van Der Linde, a guest at Ndutu Safari Lodge in Tanzania's Ngorongoro Conservation Area.
The scene is the Serengeti; the attentive mother, five-year-old Nosikitok.
The lioness has a GPS collar fitted by Kope Lion, a conservation NGO, and three young cubs of her own - born around the 27-28 June.The lioness Nosikitok recently had her second litter of cubs
Dr Luke Hunter, President and Chief Conservation Officer for Panthera, a global wild cat conservation organisation which supports Kope Lion, told the BBC the incident was "truly unique".
"It's not something that I'm aware has ever happened before between large cats like this," he said.
"We know there are cases where lionesses will adopt other lion cubs... But this is unprecedented.
"I know of no other case - between any large cat, for that matter - where the species has adopted or nursed the cub of another species."
Most lionesses would normally kill a baby leopard if they found one, seeing just another predator in a competitive food-chain.
The leopard cub, whose gender is not known, is around 2-3 weeks old
The little cub is lucky it wasn't killed on sight, Dr Hunter says
Dr Hunter says Nosikitok has cubs the same age as the young leopard - two to three weeks.
She was around a kilometre from her den, where her own cubs are hidden, when she found the spotted substitute.
"She's encountered this little cub, and she's treated it as her own. She's awash with maternal hormones, and this fierce, protective drive that all lionesses have - they're formidable mums," the lion expert notes.
It is not clear yet where the baby leopard's mother is, or if the lioness will try to adopt it full-time.
The local safari lodge say there is a resident female leopard there who almost certainly has cubs. And as Nosikitok's pride are unlikely to prove as indulgent as she is, the best outcome for the leopard would be a safe return to mum.
Dr Hunter says his team are on tenterhooks to see what comes next.
"It's a unique thing, it will be fascinating to see how it unfolds. Nature is unpredictable. Up until earlier this week, we would have said 'Nah, that never happens' - and now it happens!"With luck, the tiny leopard will soon be back with its natural mother
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