Sudan is the only male northern white rhino left worldwide
Total of 3 northern white rhinos are left worldwide -- Sudan and two females
Experts trying various ways to save the subspecies, including in vitro fertilization
Sudan, the world’s last male northern white rhino, has died. But the effort to save the subspecies from extinction lives on.
He grazes under the hot sun, his massive head lowered to the ground, at the Ol Pejeta Conservancy in central Kenya.
When he’s not napping in his enclosure, he waddles around the sprawling savannah, stopping briefly to drink water from a concrete hole.
But Sudan is not just any rhino. He’s the last known male northern white rhino left in the world.
For an animal on the verge of extinction, the fate of the subspecies rests on his ability to conceive with the two female northern white rhinos at the conservancy.
Sudan and the two female rhinos – Fatu and Najin – are the last three northern white rhinos left in the world.
Sudan and his female companions live at the conservancy, where experts are scrambling to ensure the subspecies does not go extinct.
The animals are under 24-hour protection by armed guards. Rhinos are targeted by poachers, fueled by the belief in Asia that their horns cure various ailments. Experts say the rhino horn is becoming more lucrative than drugs.
In addition to round-the-clock security, the conservancy has put radio transmitters on the animals and dispatches incognito rangers into neighboring communities to gather intelligence on poaching.
The conservancy is also raising funds to help equip and train rangers who guard the rhinos.
Old and frail
At 45, Sudan was elderly in rhino years. His daughter Najin, 28, and granddaughter, Fatu, 17, are considered spring chickens.
Though the three northern white rhinos are physiologically healthy, age might be a factor, says George Paul, the deputy veterinarian at the conservancy.
“Sudan is currently old and may not be able to naturally mount and mate with a female,” he says.
In addition, he has a low sperm count, which complicates natural and scientific efforts, experts say.
Najin could conceive, but her hind legs are so weak, she may be unable to support a mounted male.
“There has been recorded mating between different pairs over the last few years, but not conceptions,” George Paul, the deputy veterinarian at the conservancy, said. “Based on a recent health examination conducted, both animals have a regular estrus cycle, but no conception has been recorded.”
And if one is not recorded soon, the beloved animal will go extinct.
Alternative methods to conceive
In a race against time, international experts are resorting to science to try to sustain the subspecies.
The northern white rhino cannot mate with a black rhino, but there is a chance it could mate with a southern white rhino, Paul said. While southern white rhinos are not endangered – Ol Pejeta has 19 – they are a different subspecies from the northern white rhino genetically. Though the offspring would not be 100% northern white rhino, it would be better than nothing, experts say.
A committee at the conservancy is also looking at various alternative reproduction techniques, including in vitro fertilization.
“In other countries, success has been achieved with embryo transfer in a different rhino species, thus that, as a technique, can be presupposed to be the most promising,” Paul said. “However, consultations are ongoing amongst different reproductive technique experts on the way forward.”
Countdown to extinction
The need to preserve the northern white rhino is dire.
Paul said he’s optimistic.
The conservancy acquired the northern white rhinos – two males and two females – in 2009 from a zoo in the Czech Republic. Suni, the other male northern white rhino at the conservancy, died last year.
There are no known northern white rhinos left in the wild. A total of three remain in captivity worldwide – all in Kenya,
It’s now up to Najin and Fatu to help keep the subspecies alive.