Display-flight of Sparrowhawks I was interested in the note by R. A. Hume and P. L. Garvey on the possible display-flight of four Sparrowhawks Accipiter nisus on 25th January 1970 (Brit Birds, 63: 132). The unusual features were the number involved and the early date, compared with the one or two birds and the mid-March to midMay period in The Handbook. Most of the data in that work were taken fro...
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