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Caspian Gull Larus cachinnans started to nest in Poland in the early 1980s. Since 1989 this species has started to nest regularly, but no complete survey of breeding population has been done so far. To describe abundance trend, we collected data on numbers and distribution of breeding Caspian Gulls until 2020 from the whole country. The census in 2021 allowed to estimate complete or near-complete...
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