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50 species of birds still live in Germany. In 1800 there were 1,250 - a decline of 80%. Ornithologist Peter Berthold is one of the first to raise the alarm and expose humans as plunderers of nature and habitat. By setting up 120 biotopes, he has now taken bird protection into his own hands to prevent the worst - a silent spring. -- Discover the real heroes next door with HELDENLÄNDLE: cellar tinkerers and castle-builders, hobbyists and home brewers, sprinters and those who come to the Ländle. We have set out on an adventurous search for unusual stories in the southwest. 👍🏻 More heroic stuff on Facebook https://fb.me/heldenlaenlde 📸 Take a look behind the scenes on Instagram / heldenlaendle 🎬 More from Regio TV can be found here: https://www.regio-tv.de A production by Regio TV Bodenseefernsehen GmbH + Co. KG