Cetti's Warbler
13 May 2015
Cetti's Warblers have undergone a huge range expansion over the last 3 decades, only slightly put back by the recent sequence of cold winters. The indications are that since then, numbers are increasing again, with perhaps more than 2,000 territories in southern Britain. However, where they are now commonplace, some key sites are not receiving regular counts, leading to underestimates of numbers.
Like all species on the Rare Breeding Birds Panel (RBBP) list, please add a breeding code for any Cetti's Warblers recorded in breeding habitat. For tips on what to record, please download the RBBP's advice on recording breeding evidence and rare breeding birds using BirdTrack [PDF].
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