A critically endangered Bornean orangutan has been born at Chester Zoo. 

The tiny infant was delivered safely by experienced mum Leia in the early hours of Tuesday 7 October, following an eight-and-a-half-month pregnancy.

Primate experts at the zoo have hailed the birth as 'an important step forward' in efforts to safeguard the species.

Bornean orangutans are highly threatened in the wild due to deforestation, illegal hunting and conflict with people.

This ranks them as a species requiring the highest conservation priority, according to the International Union for the Conservation of Nature (IUCN).

The newborn in Chester joins an international conservation breeding programme that's working to protect the species from extinction and ensure its future for generations to come.

"Leia is a wonderful mum," said Chris Yarwood, assistant team manager of Primates at Chester Zoo.

"She's extremely attentive and has spent the first few days holding her baby close, feeding regularly and forming a really strong maternal bond. It's a huge privilege to witness.

"The baby is still tiny and we haven't yet been able to determine the sex - but what really matters is that it's healthy and that Leia is doing a brilliant job, as we knew she would."

The tropical forests of Borneo - the only place on Earth where Bornean orangutans are found in the wild - have suffered devastating losses in recent decades.

More than 40% of its tropical forests have been lost since 2000, due to unsustainable palm oil production, logging, agricultural expansion, poaching and illegal hunting. 

Bornean orangutans are one of three orangutan species, all of which are critically endangered.

Chester Zoo is the only zoo in the UK to care for two of them – the Sumatran and Bornean orangutan. 

As one of the planet's closest living relatives to humans, they play a vital role in maintaining the health of their rainforest ecosystems.

Cat Barton, Policy Lead on Deforestation-free Commodities at Chester Zoo, added: "Chester Zoo has worked with partners in Borneo for more than 20 years to safeguard wild orangutan populations, restore rainforest habitats and tackle the root causes of deforestation.

"This is a huge milestone for our partners at HUTAN and for global conservation.

"Closer to home, we continue to champion the use of sustainably sourced palm oil, encouraging individuals and businesses to make better choices that protect rainforests and the countless species that depend on them.

"With palm oil found in so many everyday products - from biscuits to shampoo - choosing certified sustainable options is one of the simplest, most powerful actions people can take to help wildlife, including orangutans like Leia's baby."

Chester Zoo's conservationists have worked with the NGO HUTAN in Borneo for more than 20 years to study orangutan behaviour and provide practical conservation solutions.

This includes assisting in the reforestation of a wildlife corridor connecting two important areas of habitat, aiding orangutans to move safely between them.