Twenty-five years ago, in April 1970, the talking point was an unprecedented invasion of at least 40 Little Egrets Egretta garzetta, the first 12 all arriving during 17th-19th April; in contrast, there was none in autumn. In the same month, British Birds subscribers were reading that: 'Although considered to be largely sedentary, the Wallcreeper Tichodroma muraria has been recorded as a vagrant abo

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