DCCO and the use of...

DCCO and the use of "H" or "X"  

 Roxane Filion

According to Birds of the World, Double-crested Cormorants can forage up to 62 km from their breeding colony. Since any DCCO observed feeding on a body of water during the breeding season could, in reality, be foraging 6 full squares from their nesting location, when is it recommended to use the "H" breeding evidence code? Are there any additional guidelines we should consider for DCCO when entering/accepting "H"(ex: size of lake, presence of islands, ...) or should we always prioritize "X" when in doubt?

P.S. In easily accessible, well-birded squares, it's no problem (for example, we can see DCCO feeding on Porcupine Lake at various dates in June, but we are fairly confident that there are no colonies in the square, so we use X) However, it's not always that evident if it's a more remote square. 

Thank you


Topic starter Posted : 27/10/2021 10:03 am

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