Sir David Attenborough has been left ‘seriously impressed’ by a rare mating ritual, as he described a never-before-filmed comical dance routine developed by a unique bird seen in an upcoming episode of Planet Earth III.

The naturalist and TV broadcaster, 97, said ‘bird courtship is just one of the most dramatic sequences you can get’ when explaining a segment set to appear in the new Forests episode of the BBC programme airing on Sunday.

‘It’s designed to impress a female, and it impresses you,’ he added.

It shows the male Temminck’s tragopan ‘pumping up a pair of horns and a multicoloured bib’ in the hope of impressing a female in the mountainous forests of central China.

Sir David, who recently had a long-beaked echidna, described as having the spine of a hedgehog, the snout of an anteater, and the feet of a mole, named after him,said: ‘In tropical circumstances there is a superabundance of food, he’s got time to spare and therefore what he does with it is to say “I’m now going to show you something, honey, that you’ve never seen before”. And it’s true.

‘It’s nature sort of showing off. And the way in which, in this rather demure way, she says “I think you’re rather boring and I’ll go somewhere else” is really very engaging.’

Sir David Attenborough was left ‘seriously impressed’ (Picture: BBC)

This is the first time ever that the mating ritual has been filmed in the wild, and took six weeks to capture.

Forests producer and director Sarah Whalley told the PA news agency: ‘Capturing this magnificent courtship display in the wild was a real challenge because the birds are so elusive and live in remote difficult terrain.

‘Our crew waited six weeks to get the shot, and wow was it worth it.

‘David was certainly impressed, and we can’t wait to share this charming behaviour with everyone at home.’

The ritual was caught on camera in the wild for the first time (Picture: BBC)

‘It’s designed to impress a female, and it impresses you.’ (Picture: BBC)

The episode is billed as Sir David’s journey into the ‘hidden world of forests where lives are entwined in the most unexpected of ways’.

It is set to include the temperate rainforests of Canada, where ‘rarely seen spirit bears fish for salmon’, to the teak forests of India, where ‘whistling wild dogs work together to bring down prey three times their size’.

Meanwhile, in the dense tropical rainforest, ‘treehoppers form surprising alliances to fight off assassin bugs’ and ‘oriental pied hornbills go to incredible lengths to protect their young’, the BBC previously said.

Sir David said: ‘This is a world where nothing is quite as it seems – full of strange connections, often hidden from us.

‘Only now are we beginning to see life in the forest from a new perspective.’

Planet Earth III continues on BBC One at 6.20pm on Sunday, November 19.

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‘It’s designed to impress a female, and it impresses you.’