The willow warbler, easily confused with other visitors, breeds throughout Britain, from Cornwall to Shetland

What’s the commonest summer visitor to our shores? The swallow perhaps, or the swift? The house martin, or the blackcap?

Actually it’s the willow warbler – a bird not all that many people have heard of, let alone heard. Yet the silvery, shivery song of this tiny, leaf-like sprite is the accompaniment to the burgeoning of spring – from the Isles of Scilly in the south to Shetland in the north.

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Source: Guardian Environment