Stovky ornitologů v Česku a tisíce dalších ve 143 zemích světa tradičně vyrazí o víkendu 18. a 19. ledna sčítat vodní ptáky na řeky, rybníky, přehrady, jezera a mořská pobřeží. Zapojí se tak do nejstaršího a nejrozsáhlejšího projektu tzv. občanské vědy (citizen science) – Mezinárodního sčítání vodních ptáků, které se koná již od roku 1966.
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