The underlying assumption that the number of Marsh Tits would remain constant regardless of scheme is wrong, though. And, yes there might have been a local decline because the breeding-pair based atlas is older than both casual citizen science schemes (still, there is a difference between the last two). Of course, the ratio of Marsh Tit vs Willow Tit is variable across Poland: the dominant species varies even between adjacent geographical areas if different types of habitat predominate in those respective places. Everybody makes mistakes. 
Most importantly, I'm glad about my sightings.
Most importantly, I'm glad about my sightings.
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