1951 we were able to study a pair of Blue Tits (Parus aeruleus) nesting in a garden at Wilnecote, north Warwickshire, and the following are some of the more outstanding observations. Both birds had been trapped and colour-ringed in the winter. They were thought to be paired by February 3rd as they were almost invariably together from that date. Nest-site prospecting began on March 18th by the fema...

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