The colours used are as follows:
RED pentads have no surveys, so another four are required;
YELLOW have one survey, so need another three;
GREEN have two, so only need another two;
BLUE have three so only require one more.
In an effort to ensure some seasonality in the coverage, I have also excluded all pentads with a survey returned for autumn [basically Mar, Apr or May].
So if you are getting out further afield this autumn, or in the string of public holidays coming up, please consider using this map to plan your birding.
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