Nursing story

(Image credit: Joop Van Der Linde/Ndutu Lodge)In an unexpected first, wildlife experts have identified a lioness nursing a leopard cub. Normally, these two big-cat species do not get along, and it's surprising the lioness didn't kill the cub outright, experts told Live Science.

Perhaps the "genuinely unique" experience happened because the lioness has a litter of cubs that are about the same age as the approximately 3-week-old leopard, and her maternal instincts kicked in when she encountered the cub, said Luke Hunter, the president and chief conservation officer of Panthera, a global wild cat conservation nonprofit based in New York City.

Whatever the reason, the cub's future is uncertain. If the lioness brings it back to her litter, it's unlikely that the rest of the pride would accept it, Hunter said. The best-case scenario would be for the leopard's mother to reclaim her baby, he said. [ Read the Full Story on the Lioness Nursing the Leopard Cub]

Dinner time

(Image credit: Joop Van Der Linde/Ndutu Lodge)A guest staying at the Ndutu Lodge in Tanzania's Ngorongoro Conservation Area snapped these photos on Tuesday (July 11).

Fuzzy cub

(Image credit: Joop Van Der Linde/Ndutu Lodge)The last common ancestor of the lion and leopard lived about 2.5 million years ago, but the two species still have similar milk and comparable nursing periods.

Collared mother

(Image credit: Joop Van Der Linde/Ndutu Lodge)The lioness has a collar with a GPS tracking device so that KopeLion can keep records of her whereabouts. KopeLion is a nongovernmental organization that works to promote a sustainable lion and human co-existence.

Different species

(Image credit: Joop Van Der Linde/Ndutu Lodge)There are cases of mountain lion and leopard mothers adopting cubs within their own species, but it's unheard of for a big cat to nurse a cub from another species, Hunter told Live Science.

Cubs galore

(Image credit: Joop Van Der Linde/Ndutu Lodge)The lioness, known as Nosikitok, was less than a mile from her litter when she suckled the leopard cub, Hunter said. Nosikitok later joined with some other adults from her pride, and it's unclear where is leopard cub is now.

Vulnerable species

(Image credit: Joop Van Der Linde/Ndutu Lodge)The leopard (Panthera pardus) is listed as a vulnerable species by the International Union for Conservation of Nature (IUCN). Wild leopards live throughout Africa and Asia, but their populations have become reduced and isolated from one another, the IUCN said.

Leopards are now regionally extinct in these areas: Hong Kong, Jordan, the Republic of Korea, Kuwait, Lebanon, Mauritania, Morocco, Singapore, the Syrian Arab Republic, Togo, Tunisia, the United Arab Emirates and Uzbekistan, the IUCN reported.

Little cub

(Image credit: Joop Van Der Linde/Ndutu Lodge)The lioness gave birth to three cubs of her own in late June. It's possible she might bring the leopard cub back to her litter and raise them together, Hunter said. But were the lioness to take the leopard to the pride, the other adult lions would probably kill it, he said.

Leopard babe

(Image credit: Joop Van Der Linde/Ndutu Lodge)It's unclear where the leopard's mother is, but wildlife experts hope she will come forward to reclaim her cub and finish raising it.

[ Read the Full Story on the Lioness Nursing the Leopard Cub]