The morning started bright with only a slight breeze and the first bird out of the nets was a Cetti's Warbler, so all seemed well. Unfortunately it did not last, the breeze strengthened, the skies clouded over and it started to rain. The rain eventually made us take the nets down early and we ended with 32 birds of which 22 were new. The usual mix of birds, the only surprise, other than the Cetti's was a Whitethroat. Thanks to Ian for the pics.
The only British passerine with 10 rather than 12 tail feathers.
Examples of baldness in birds like this Great Tit are not that uncommon and there are various possible causes including mite damage, fungal infections and nutritional deficiency.