Displacement coition in the Mallard.--On ioth May, 1951, a t Clayton-le-dale, near Blackburn, Lancashire, I was engaged in watching the behaviour of a pair of Mallard (Anas platyrhynchos) tending fifteen young, which were newly hatched. T h e young fed for the most part within a radius of three yards of the female Mallard, but occasionally one strayed further afield. Immediately this happened, the...

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