David Attenborough has given a sneak peek into his latest nature documentary ahead of its release this Sunday. 

Stunning images from the documentary showcase the diversity of the Asian continent after the crew crisscrossed the continent over four years. 

The series will show animals as far north as the Baikal seal in Russia and all the way down south to the Pangolin in Singapore.    

Thanks to their hard work, never-before-seen footage of rare animals was filmed.

This includes a Gobi bear, one of just 32 left in the world, and it marks the first time the endangered species has been captured on camera. 

The crew also managed to snap a footage of one of the rarest birds in the world - the Javan green magpie.

In Sri Lanka, the camera crew tried 50 times to get a shot of an elephant reaching into a bus looking for food. 

Meanwhile in Nepal, drones allowed the team to capture footage of tigers mating and hunting.

Sir David, who has worked for the BBC since 1952, turned 98 while they were making the series. Series producer Matthew Wright revealed that the crew sang happy birthday to the national treasure.

Mr Wright, in words reported by the Daily Mirror, said: 'We said "happy birthday". He was business-like. He said, 'Let's move on. What are we doing next?' 

Producer Mark Wheeler said: 'He's pretty remarkable. The British public look to him as a real authentic voice. He's as enthusiastic as ever.' 

Asia will begin on BBC1 on Sunday, with all episodes on iPlayer.