AnimalsLast of the Wild

The Unprecedented Plan to Save the Sumatran Rhino

Conservationists have launched an urgent bid to save the critically endangered Sumatran rhino, which has a wild population of fewer than 80.

AnimalsLast of the Wild

The Unprecedented Plan to Save the Sumatran Rhino

Conservationists have launched an urgent bid to save the critically endangered Sumatran rhino, which has a wild population of fewer than 80.

There’s no creature on earth like the Sumatran rhino.

With a thin coat of iron-tinged hair and a lifestyle adapted to the mountainous rain forests of Indonesia, these are the smallest rhinos on earth. They are also the most endangered rhino species—and isolation threatens to wipe them out.

Experts now estimate that around 80 of these rare creatures remain between the islands of Sumatra and Indonesian Borneo, and the survivors are split into around a dozen subpopulations with no gene exchange.

“They’re in tiny little pockets, some as small as one and two left in the forest,” says CeCe Sieffert, deputy director at the International Rhino Foundation.

In fact, the remaining rhinos have become so fragmented, the world’s experts now consider isolation the greatest threat to their existence, overtaking poaching and habitat loss. Making matters worse, due to a quirk of their biology, if females go too long without breeding they develop problems in their reproductive tracts that can prevent successful pregnancies.

Now, a coalition of international conservation organizations, including the National Geographic Society, announced a new plan today (Sep. 20) to turn the animal’s fortunes around. It’s called the Sumatran Rhino Rescue.

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Harapan, a four-year-old male Sumatran rhino (Dicerorhinus sumatrensis) and one of the first of its species to be bred in captivity.

At its heart, the new effort aims to safely capture as many wild rhinos as possible and then transfer them to nearby sanctuaries where scientists and wildlife managers can assist in their reproduction.

There’s currently only one such facility, called the Sumatran Rhino Sanctuary, built by the International Rhino Foundation in Way Kambas National Park in south Sumatra. Other facilities are planned for the north end of the island and across the way in Indonesian Borneo, too, provided the coalition can find enough wild rhinos from those regions to start captive breeding.

The project is led by the International Union for Conservation of Nature’s Species Survival Commission, in coordination with Global Wildlife Conservation, International Rhino Foundation, National Geographic Society, and WWF. The Indonesian government has also welcomed the formation of the new coalition, with a spokesperson calling it "of critical importance" to their effort of establishing "a national conservation breeding program."

“If we wait a few more years, there won’t be enough rhinos left to bring together,” says Barney Long, senior director for species conservation at Global Wildlife Conservation.

“Every month that goes by with each animal not breeding is a lost opportunity,” says Long.

Sumatran rhino

(Dicerorhinus sumatrensis)

Height:

3.3–5 feet

Weight:

1,320–2,090 pounds

RHINOCEROS COLLAPSE

The number of Sumatran rhinos has dropped

an estimated 70 percent in the past two

decades, mostly due to poaching. Fewer than

a hundred remain in Indonesia, in isolated

pockets. Sumatran rhinos are solitary creatures.

They’re small compared with other rhino

species, and females give birth about every

three to five years.

asia

pacific

Ocean

Historic range

pacific

Ocean

Indonesia

aus.

Low Birth Rate

Small populations mean the Sumatran rhino’s

potential to reproduce is diminished, putting it

at a higher risk for extinction.

Out of Sight

Sumatran rhinos live in remote areas, so

sightings are rare and population figures are

often disputed. Camera traps are the primary

source of documentation.

A Species in Jeopardy

Isolation is the biggest threat to

Sumatran rhinos. In 2015 they were

declared extinct in the wild in Malaysia.

SUMATRA

Less than 75 rhinos

10 subpopulations or clusters

Thailand

Singapore

Wild rhino population

Park or reserve

Sumatran Rhino Sanctuary

In captivity

7 (3 males, 4 females)

3

LEUSER ECOSYSTEM

Less than 50 rhinos

6 subpopulations

1

BUKIT BARISAN

SELATAN N.P.

Less than 5 rhinos

2 subpopulations

WAY KAMBAS N.P.

Less than 20 rhinos

2 subpopulations

Tabin Wildlife Reserve

In captivity

2 (1 male, 1 female, not reproductively viable)

Wild rhino population

Brunei

Park or reserve

Celebes

Sea

Java Sea

INDONESIAN BORNEO

Less than 10 rhinos

Rhinos have been seen in the Kutai Barat and Mahakam Ulu Regencies, with other rumored sightings by locals.

Lauren E. James, Clare Trainor, NGM Staff

Art: Joe McKendry

Sources: Global forest watch; Protected

planet; Global wildlife Conservation;

International Rhino Foundation; World

wildlife Fund; IUCN Species Survival Commission

The Leuser Ecosystem

Out of Sight

Gulf of

Thailand

Sumatran rhinos live in remote areas, so sightings are rare and population figures are often disputed. Camera traps are the primary source of documentation.

This mountainous tropical rain forest is home to several small, scattered populations of Sumatran rhinos.

Tabin Wildlife Reserve

In captivity

2 (1 male, 1 female, not reproductively viable)

Royal Belum

State Park

Brunei

Bandar Seri Begawan

Gunung Leuser N.P.

Taman Negara N.P.

Danum Valley Conservation Area

LEUSER

ECOSYSTEM

Less than 50 rhinos

6 subpopulations

Kuala Lumpur

Lake

Toba

Celebes Sea

Singapore

SUMATRA

Less than 75 rhinos

10 subpopulations

or clusters

WAY KAMBAS N.P.

Less than 20 rhinos

2 subpopulations

Kerinci Seblat N.P.

Last record of

wild rhino: 2004

asia

Sumatran Rhino Sanctuary

Historic range

Low Birth Rate

In captivity

7 (3 males,4 females)

pacific

Ocean

pacific

Ocean

BUKIT BARISAN

SELATAN N.P.

Less than 5 rhinos

2 subpopulations

Small populations mean the Sumatran rhino’s potential to reproduce is diminished, putting it at a higher risk for extinction.

Java Sea

Indonesia

Jakarta

aus.

RHINOCEROS COLLAPSE

A Species in Jeopardy

Height:

3.3–5 feet

Isolation is the biggest threat to

Sumatran rhinos. In 2015 they were

declared extinct in the wild in Malaysia.

The number of Sumatran rhinos has dropped an estimated 70 percent in the past two decades, mostly due to poaching. Fewer than a hundred remain in Indonesia, in isolated pockets. Sumatran rhinos are solitary creatures. They’re small compared with other rhino species, and females give birth about every three to five years.

Sumatran rhino

Wild rhino population

(Dicerorhinus sumatrensis)

Last observed wild rhino location

Park or reserve

Weight:

1,320–2,090 pounds

Lauren E. James, Clare Trainor, NGM Staff. Art: Joe McKendry

Sources: Global forest watch; Protected planet; Global wildlife Conservation; International Rhino Foundation; World wildlife Fund; IUCN Species Survival Commission

From Disaster to Hope

This isn’t the first time conservationists have recommended rounding up Sumatran rhinos for captive breeding.

“There was a big capture operation in the ‘80s and ‘90s, which in some ways was a bit of disaster,” says Long. “The captures all went very well, but the animals were dispersed among numerous facilities, and we didn’t know how to breed them.”

But the outlook is much different now, thanks to a scientist by the name of Terri Roth.

“We conditioned females to allow us to do rectal ultrasound exams so we could actually look at the ovaries and see what was happening,” says Roth, vice president of conservation and science at the Cincinnati Zoo and Botanical Garden.

Using this and other techniques, Roth’s team was able to coax their captive female, Emi, to pregnancy in 1997. But it was not to be.

“I’d seen a heartbeat and a little fetus so we thought everything was developing fine,” says Roth. “And then the following week I did an ultrasound exam and the thing had just completely disappeared. It was like your worst nightmare.”

Over the course of the next two years at the Cincinnati Zoo, Emi would miscarry four more times. All the while, Roth tweaked her methods, finally deciding to supply the rhino with supplemental hormones. Then, about 36 hours after the events of 9/11, a modern conservation miracle took place.

“The first calf was born on September 13th, 2001, and my last concern was alleviated as he was coming out,” says Roth. “I saw him move his front leg, and I knew he was alive.”

They named him Andalas—an old Indonesian word meaning Sumatra—as he was the first Sumatran rhino born in captivity in 112 years.

New Genes

Emi gave birth to two more calves in the next six years, but in 2009 she unexpectedly died from hemochromatosis—a condition where the body absorbs too much iron.

But all was not lost. Back in 2007, the decision had been made to transport Andalas to his ancestral home in Indonesia, where he went to live at the 250-acre Sumatran Rhino Sanctuary, a facility built by the International Rhino Foundation.

With Roth’s guidance, this sanctuary was even able to help Andalas sire a calf of his own by 2012. As the first captive Sumatran rhino to be born in Southeast Asia, the staff named him Andatu, which means “gift from God.”

Another calf, a female named Delilah, was born in 2016.

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Sumatran rhinos are the smallest living rhino species and also the hairiest. The animals are more closely related to the extinct wooly rhino than they are to any of the living species.

It is upon this legacy that the Sumatran Rhino Rescue hopes to build. The sanctuary currently has seven rhinos in its care—three males and four females, none of which are pregnant.

Two of these are breeding age, says Sieffert, and one has had a few miscarriages.

But even if the new hormone techniques are able to produce more calves at the sanctuary, the facility will still suffer from an enormous problem.

“They need new genes,” says Roth. “Too many Sumatran rhinos now are related to the Cincinnati line, and we need some new, fresh animals in that population.”

Catching the Stragglers

The plan to capture new rhinos from the wild is already underway.

Going off photographic evidence obtained with remote cameras, WWF is already trying to locate a lone rhino thought to be living in a mining concession in Indonesian Borneo, also known as Kalimantan. And more cameras are going up all over Sumatra in an attempt to zero in on other dwindling populations in peril.

“We’re trying to get the stragglers that don’t have the opportunity to breed,” says Sieffert. “We just can’t let that critical genetic material be lost forever, so we’re trying to catch it while we can.”

You may be wondering: How does one catch an animal that weighs 1,700 pounds? Conservationists do so by creating holes covered with branches and leaves, which rhinos fall into. Believe it or not, it’s the safest and most effective method for catching them. "It sounds risky," says Long, "but it's not something that's been seen to cause injuries."

Depending on how the captures go, the hope is to house a handful of the animals at a new facility being built at the sanctuary in south Sumatra. This is because the current facility is already at full capacity, says Zulfi Arsan, senior veterinarian at the sanctuary.

Then, if enough other animals can be secured, the goal will be to construct new captive breeding facilities in north Sumatra and maybe even across the Java Sea in Kalimantan.

Doing so will neither be easy, nor cheap. Sumatran rhinos are solitary animals that become violent when housed together. At the Sumatran Rhino Sanctuary, for instance, each animal lives in its own section of fenced off rain forest, with uninhabited sections serving as buffers in between enclosures. Every six months, Arsan and his colleagues rotate the animals to allow the plants on which the rhinos depend, like macaranga, to grow back.

This is why each of the founding members of the coalition have agreed to donate $1 million at the start of the project with the hope to raise $30 million in total.

"We haven't even started actively fundraising yet and we have a good chunk of the budget in the bank, so that's a good sign," says Jon Paul Rodriguez, chair of the IUCN's Species Survival Commission. "There's no other best case scenario I can imagine for the Sumatran rhino at the moment."

“It sounds like a lot,” says Jonathan Baillie, chief scientist at the National Geographic Society. “But when you kind of think about how special this species is and the amount of years that it’s been on the planet, it’s not a big investment at all.”

The Road Ahead

“What’s being proposed in the Sumatran rhino conservation plan is something that I would have been deadly opposed to thirty years ago,” says Eric Dinerstein, an expert on Asian rhinos who is not affiliated with the project.

Dinerstein spent 25 years working with WWF on conservation and he explains that he was among those who thought conservation dollars would be better spent protecting the animals in the wild. After all, a similar strategy had already been proven effective for the southern white rhinos of KwaZulu-Natal and the greater one-horned rhinoceros in Nepal.

View Images
Conservationists hope animals like the one seen here at the Sumatran Rhino Sanctuary in Indonesia can produce enough new calves to keep the species from going extinct. Just 80 of the critically endangered animals are thought to be left in the wild.

However, given the current state of affairs in Indonesia, Dinerstein says his outlook has changed.

“Now I’m the biggest supporter of it, because I think it’s the only chance that Sumatran rhinos have to survive as a species,” he says.

In his view, the only way forward is to put as many baby rhinos on the ground as possible—and fast. A task easier said than done, of course.

“Establishing multiple facilities that are successful in breeding the species is going to be much more challenging than people anticipate,” says Roth.

“It’s really hard to transfer that information and technology and see it used correctly by others. The team at the Sumatran Rhino Sanctuary right now is doing a wonderful job, but it has taken us a long time to establish a team that really does understand it and is doing it correctly,” Roth says.

With a critically endangered species, there will always be risks involved, says Margaret Kinnaird, wildlife practice leader for WWF International.

“It doesn’t always go right, and there are still chances that we lose some animals,” she says.

“But we’ve got to give these guys and girls a chance. And I think this is how we give them that chance.”