This 22 January 2017 video says about itself:
Freeing Migratory Birds from Illegal Lime Stick Traps
The film explores the wonder of these tiny globe-flying marvels, millions of which are unlawfully slaughtered each year for large sums on the black market, and follows an intrepid squad of pan-European bird-lovers who risk their lives waging a secret war against poachers, disrupting illegal trapping and freeing as many birds as possible.
From the Cornell Lab of Ornithology in the USA this month:
Can Caged Birds Tell Us Where They’re From?
Every year millions of birds are illegally captured and sold as pets. A lucky few get rescued by wildlife officials—but then how do they get home again? Researchers are beginning to narrow down where some birds come from, by analyzing song “dialects” using our Macaulay Library archive as a reference.
Read more on how voices can help conservation.