Chiffchaff; Mosquitero Común

The Arctic Warbler is rare over here, except where it breeds in the far north of Scandinavia, but in Spain the Chiffchaff must be the most abundant bird in winter especially along the east and south coasts bordering the Mediterranean and they are not afraid of humans, feeding at little more than arms length away so are relatively easy to photograph although they rarely stay still for long. Along with White Wagtails they are often seen hovering over water in the marshes while searching for insects, or sitting along the banks of rivers and dykes in company with Stonechats and Wagtails and flying out after insects every few seconds, in the manner of flycatchers. In spring and summer many head north and they disappear up into the trees where they are harder to see, but easily heard and identified by their "song", from which their name is derived.

I am not aware of them being there, it is certainly outside their recorded range of Europe and Asia, but there are many similar Warblers here and I suspect there are many similar in America also.