Wytham Woods' Great Tit study celebrates 75 years and reveals how spring has advanced a calendar month in that time.
On 27 April 1947, the first Great Tit egg of the year was counted in the University of Oxford's 'living laboratory' at Wytham Woods. It was to be the start of a deep and on-going relationship between the bird population and generations of researchers.
Seventy-five years later, in 2022, the year's first Great Tit egg was counted on 28 March; almost exactly a month earlier than its predecessor from 75 years ago.
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