W.A.G.B.I. hand-reared Mallard in the cold spell of 1962-63
Recoveries of W.A.G.B.I. hand-reared Mallard during and after the hard weather of 1962-63 show that these duck undertook a marked weather migration, with a directional bias between S.E., through W. to N.W. Mortality figures as available at present indicate that there was some increase resulting from the cold spell.
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