10 CETTI’S WARBLER
Unknown in the UK until 1961, the northerly expansion of the Cetti’s Warbler has brought this species into London (and beyond). It is an unobtrusive and skulking little bird, most easily identified by its sudden explosive song. Most warblers leave our shores in the winter, heading for warmer climes, but the Cetti’s Warbler, and increasingly the Blackcap, stay on. As our climate changes we can expect more range shifts as species adjust. As with previous environmental changes in London, this could spell opportunity for some species but disaster for others. London’s birdlife is anything but static and has some surprises in store for those who visit or who, like the Cetti’s Warbler and myself, decide to stay. Turn back to page 48 for Dominic Couzens on Cetti’s Warbler.