Plumage variability of Marsh Harriers - British Birds
the paper above is well worth a read and study - baffled, you will be when trying to age and sex birds -- I have long been of the opinion that females in the local population occur in the sort of standard dark chocolate plumage with another rufous morph / plumage occurring infrequently but regularly enough to assume it is not just a one off occurrence -- ageing males on plumage I still wonder about with reference to the above paper but it looks as if they call every bird that is 3cy or older adult which is a bit confusing -- in the fighting shots the young male is the upper bird and the rufous female the lower
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