THE Handbook of British Birds states that on the continent Magpies may roost in hundreds, but I have not heard of a roost of any magnitude in this country. On March 30th, 1942 near Northallerton the chattering of Magpies (Pica p. pica) drew my attention to- an extremely dense coppice composed almost entirely of hawthorn, and covering an area of about 1,000 square yards. The thicket was sited on t...

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