Story highlights A previously undiscovered population of lions is found in Ethiopia

Local stories around for years but existence of the lions has not been confirmed until now

(CNN) A previously undiscovered population of lions has been found in a remote national park in Ethiopia.

Following an exploratory expedition, wildlife conservationists from Oxford University in England were able to confirm anecdotal stories from park staff and locals of lions living in the Alatash National Park in North West Ethiopia, close to the Sudan border.

"Lions are definitely present in Alatash National Park and in Dinder National Park. Lion presence in Alatash has not previously been confirmed in meetings at national or international level," said Hans Bauer, leader of the expedition.

Photos: Living on the brink: Africa's dying species Photos: Living on the brink: Africa's dying species Africa's endangered animals – Africa is home to much unique wildlife, but many of its iconic species are threatened. Using information from the International Union for Conservation of Nature, we look at some of its most endangered animals. Hide Caption 1 of 11 Photos: Living on the brink: Africa's dying species Mediterranean Monk Seal – Mediterranean Monk Seal:

There are fewer than 450 left in the wild, including a colony of about 130 off the coast of Mauritania and Western Sahara.

These seals were once a common sight in Europe and along the West coast of Africa. More recently, their numbers have dwindled to the point of near extinction. They have been hunted by fishermen, who see them as competition; many of the caves that they use for breeding have been destroyed. In 1997, around two thirds of the African population died, possibly from disease or toxic algae blooms.

Source: IUCN Hide Caption 2 of 11 Photos: Living on the brink: Africa's dying species Drill Monkey – Drill Monkey:

Between 3,000 and 8,000.

In Cameroon -- the heart of their range -- new factories and settlements have cleared much of the drill's habitat. In Nigeria, where they also live, their numbers have declined due to excessive hunting. Many drills are killed by local farmers protecting their crops. Though there have been some attempts at reforestation, often the newly planted crops are incompatible with the drill monkey's diet.

Source: IUCN Hide Caption 3 of 11 Photos: Living on the brink: Africa's dying species Addax – Addax:

It is estimated that fewer than 300 addax live on a strip of land between Niger and Chad.

Formerly, addax were commonplace in Africa's Sahelo-Sahara region, though hunting, drought and the encroachment of pastoral lands into the desert landscape have greatly diminished their numbers. The addax population is also fragmented, which makes it difficult for them to ultimately increase their numbers.

Source: IUCN Hide Caption 4 of 11 Photos: Living on the brink: Africa's dying species Black Rhino – Black Rhino:

The black rhino population has declined by an estimated 95% since 1960, with an estimated 4,880 left.

Black rhinos are unfortunate to reside in areas with a large degree of civil unrest. Populations in Angola, Cameroon, the Central African Republic, Chad, the Democratic Republic of the Congo, Mozambique, Namibia, Rwanda, Somalia, Sudan and Uganda have been particularly vulnerable, as there has been little political incentive to protect them. Their horns are also valuable in the black market, making them a tempting target.

Source: IUCN Hide Caption 5 of 11 Photos: Living on the brink: Africa's dying species African Wild Ass – African Wild Ass:

There hasn't been a recent survey, though rough estimates put the number at about 600 throughout Eritrea, Ethiopia and Somalia.

Unfortunately, the species is regularly hunted, not just for food but for medicinal purposes (a soup made from the bones is sometimes used locally to treat ailments ranging from tuberculosis to backache). The animals also compete with local livestock for water and food. Breeding with domestic donkeys also threatens to make their species extinct.

Source: IUCN Hide Caption 6 of 11 Photos: Living on the brink: Africa's dying species Mountain Gorilla – Mountain Gorilla:

680 gorillas are spread between two isolated populations in Rwanda, Uganda and the Democratic Republic of Congo

The biggest threat to the mountain gorilla is humans. These gorillas are surrounded by some of the highest rural human population densities in the continent. Encroachment on their land, poaching, deforestation and disease (some possibly passed by humans) all continue to have an adverse effect on their population.

Source: IUCN Hide Caption 7 of 11 Photos: Living on the brink: Africa's dying species Lac Alaotra Bamboo Lemur – Lac Alaotra Bamboo Lemur:

A survey in 2004 estimated around 5,000 in Madagascar.

The lemurs are dependent on marshland for their survival. Their diet is dependent on local crops (namely papyrus stems and reed shoots). Unfortunately, much of the marsh has been turned over to make rice fields. The lemurs also face dangers from poachers, who trap them either for food, or to sell on as exotic pets.

Source: IUCN Hide Caption 8 of 11 Photos: Living on the brink: Africa's dying species Northern Bald Ibis – Northern Bald Ibis:

It is estimated that there are fewer than 500 of these birds left in the wild.

There is a cluster of these birds in Souss-Massa National Park in Morocco, though these are continuously under threat, primarily as a result of building that takes place near their breeding grounds. When breeding does occur, the eggs often fall victim to predators, as do newly hatched chicks (many of whom die as a result of starvation).

Source: IUCN Hide Caption 9 of 11 Photos: Living on the brink: Africa's dying species Rodrigues Flying Fox – Rodrigues Flying Fox:

As of 2006, there were about 4,000 of these bats living on the island of Rodrigues.

The species is particularly susceptible to tropical cyclones. In 1979, Cyclone Celine II reduced their population to around 70 bats. They've recovered in recent years, but deforestation has not only threatened their food supply, it has also made their habitats even more susceptible to cyclones.

Source: IUCN Hide Caption 10 of 11 Photos: Living on the brink: Africa's dying species Madagascar Tortoise – Madagascar Tortoise:

It is estimated that there are fewer than 400 Madagascar tortoises left in the wild.

Many tortoises have perished in fires started deliberately to improve grazing conditions for local cattle.

The species has also suffered from the illegal pet trade. They are extremely valuable in the Asian black market. It is estimated that the species could face extinction in 10 to 15 years.

Source: IUCN Hide Caption 11 of 11

"Considering the relative ease with which lion signs were observed, it is likely that they are resident throughout Alatash and Dinder."

Bauer estimates between 100 and 200 lions could live in the national park after considering factors like habitat, terrain and availability of prey animals.

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