Ankur Desai

He is now £15,000, the equivalent of $20,000 better off as a result of this discovery, isn't he?

Next we're on the trail of bird poachers in Beijing.

Police across China are cracking down on the illegal wild bird trade in a bid to bring back songbirds to the skies above the country.

Around the world, birds migrate to warmer climates for winter.

But in China, poachers mount deadly nets on bamboo poles to catch and sell the birds for profit.

Around half of all wild birds caught in China are endangered species.

A China correspondent, Laura Bicker, followed dedicated conservationists who patrol the fields of Beijing during the peak bird migration season.

Silva Gu's eyes scan the horizon for any signs of life in the darkness as we drive towards a large stretch of grassland.

Tonight, like most during the winter migration season, he's hunting the bird poachers of Beijing.

In the skies above us, millions of birds are migrating south for winter.

October in China is the equivalent of rush hour as they head to Australia, New Zealand or even Africa.

As well as navigating through storms and evading predators, they must also avoid the poachers' nets.

OK, where are they?

He's been working with the police, so the police have been nearby in the hope that they would catch the poachers.

Eventually, we hear footsteps.

He's there, he's there, he's there.

Go, go, go, he's there.

Yeah, yeah, he's there.

Careful, careful.

Silva, who's in his 30s, fit and slim, chases the poacher for around two kilometres before calling the police.