There are more than 1700 species of lichens in Switzerland, and around 25,000 worldwide. And yet we don't even notice most of them. More than half of all lichens are considered endangered today. Lichens are neither plants nor animals. But what are they then? And how does a lichen get by without water for up to 40 years? Learn exciting facts about these million-year-old double creatures, which can be found almost everywhere in an astonishing abundance of shapes and colors.
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