Kinglets and firecrests
They spend much of their time feeding on insects high in trees of coniferous and deciduous woodland meaning their high-pitch calls are often the easiest way to identify them. Incredibly, for such tiny birds, ringing has shown that goldcrests from Northern Europe and Scandinavia regularly migrate to the UK. Less is known about firecrest migrations but there is some evidence to suggest that some birds also move between the UK and southern Europe.
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