I saw a Flicker in the front yard (St Paul) this morning and, consulting Bob Janssen's Birds of Minnesota, confirmed that this was no big deal. It did prompt me to wonder and ask how the seasons are broken down in the MOU's occurrence maps. Are the seasons based on the meteorological seasons or the astronomical seasons? (For example, does a winter record date from Dec. 1 or Dec. 21?) Thanks.Tom Gilde
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