the bird fauna here is really important too — we've got a number of national rarities. you can hear the birds — this isn't a sound i'm used to living in the city! no, what we got? hold on. we've got a bit of robin going. a blue tit. yeah, there's blue tits and great tits calling. i mean, it's a lovely, sunny, pre—spring day. they're loving the sunshine and they're pumping out some song. but unfortunately, not all birds are left alone in their natural habitats, and wildlife trafficking, mainly perpetrated online, is having a major impact on the world's biodiversity crisis. carl miller has been looking at the problem. we've had catastrophic declines of whole suites of bird communities. without large tracts of forest, they're silent — they're silent forests, because the birds have been trapped out of these environments.