A team of scientists have discovered an ecosystem filled with rare and endangered species, including species that were thought to be extinct, in a “lost city” deep within a rainforest in Honduras.

The conservation team spent three weeks exploring an ancient settlement, known as the “Lost City of the Monkey God” or “White City”, in the Mosquitia rainforest and found a diverse hub of wildlife, including hundreds of species of butterflies, bats and reptiles.

Scientists also rediscovered three species that were thought to be no longer living in Honduras: the pale-faced bat, the False Tree Coral Snake and a tiger beetle which had only been recorded in Nicaragua and was believed to be extinct.

Trond Larsen, the director of Conservation International's Rapid Assessment Programme (RAP), said they were “shocked” to discover such a rich environment of rare species.

“The 'White City' is one of the few areas remaining in Central America where ecological and evolutionary processes remain intact,” he added.

Colombian reserve becomes world’s largest rainforest national park Show all 12 1 /12 Colombian reserve becomes world’s largest rainforest national park Colombian reserve becomes world’s largest rainforest national park “The Stadium,” one of the most impressive geological formations of the Serranía de Chiribiquete. Colombian Amazon Colombian reserve becomes world’s largest rainforest national park Forest burns due to the colonisation front near the northern border of Chiribiquete National Park, Colombian Amazon Cesar David Martinez Colombian reserve becomes world’s largest rainforest national park Grandpa Marcelieno and his son, of the indigenous Araracuara people, with sacred plants from the region: mambe and ambil. Colombian Amazon Cesar David Martinez Colombian reserve becomes world’s largest rainforest national park Cattle ranching at the agricultural frontier near the northern border of the Chiribiquete National Park Cesar David Martinez Colombian reserve becomes world’s largest rainforest national park Oil palm monoculture, Puerto Concordia on the Ariari River, Colombian Amazon Cesar David Martinez Colombian reserve becomes world’s largest rainforest national park Preparation of traditional sugarcane-based beverage by the indigenous Barasano people of Pacoa, on the Apaporis River, near the southeastern border of Chiribiquete National Park Cesar David Martinez Colombian reserve becomes world’s largest rainforest national park Tapir in the community of Buenos Aires, Apaporis River. Colombian Amazon Cesar David Martinez Colombian reserve becomes world’s largest rainforest national park (Left) Pictograms over 20.000 years old found on stone in the Chiribiquete National Natural Park FCDS Colombian reserve becomes world’s largest rainforest national park The main “maloca” of the Mutanacua indigenous community of Pacoa, on the Apaporis River, near the southeastern border of Chiribiquete National Park. Colombian Amazon Cesar David Martinez Colombian reserve becomes world’s largest rainforest national park “Vigilant Grandfather,” one of the Chiribiquete National Park’s representative “tepuyes.” Colombian Amazon Cesar David Martinez Colombian reserve becomes world’s largest rainforest national park Aerial view of one of the park's waterfalls FCDS Colombian reserve becomes world’s largest rainforest national park Ajajú River, Chiribiquete National Park. Colombian Amazon Cesar David Martinez

The RAP also discovered 22 species that have never been recorded in Honduras before, such as the endangered Great Green Macaw, and a livebearing fish that researchers believe is new to science.

In total, scientists discovered 246 species of butterflies and moths, 30 species of bats, and 57 species of amphibians and reptiles.

Mr Larsen said the diversity of the area’s wildlife made it a high priority for conservation.

“One of the main reasons we found such high species richness and abundance of threatened and wide-ranging species (e.g., peccaries) is that the forests around the White City remain pristine, unlike much of the region,” he said.

“This makes the area a high conservation priority for maintaining the broader landscape connectivity that is essential for the long-term persistence of biodiversity through Central America.”

Explorers have searched for decades to find the White City, which is thought to have been home to an ancient civilisation in the pre-Columbian era.

Due to the lack of infrastructure in the region, scientists had to be flown in by helicopter and guarded by armed soldiers to protect them from drug traffickers and predators in the area.

Mr Larsen said the biggest threat to the region was illegal deforestation for cattle ranching, despite the “lost city” being officially protected by Honduras’ president in 2015.

Dr John Polisar, a member of the RAP expedition team, called for strong protection to allow the newly-discovered wildlife to thrive.

"We have been doing field work in the indigenous territories of La Moskitia for 14 years, and this site stood out as being simply gorgeous,” he said.