'ROOKS COLLECTING RUBBER OBJECTS. The Rooks (Corvus f. frugilegus) of Wanstead Park have a strange custom which may not have been brought before the notice of readers of British Birds. For more than twenty years they have been in the habit of collecting rubber bands and scraps of articles made of rubber.,. portions of a child's balloon, a piece of bicycle tyre and an inch of rubber used for mending


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