In February I've joined Slovakian Bat Conservation Society for their yearly census of bats in Opal mines. That's the oldest opal mines in the world, for around 100 they been closed, and recently opened for tourism. But it also perfect place for bats to hibernate during winter. And that's why it's the best time to count them to monitor their population.

Slovakian Bat Conservation - netopiere.sk/en/
Slovakian Opal mines - slovenskeopalovebane.sk/en/hom…

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