We who learnt our migrants from the Witherby Handbook and post-war observatories were told to be patient when the target was our first `Greenland Wheatear' Oenanthe oenanthe leucorhoa. `None before the last third of April and most in May' was the sum of the lessons. I still recall the great excitement on the Isle of May on 21st April 1950 when a bird caught in a mobile box trap passed the wing-lengt
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