That unmistakable "chiff-chaff-chiff-chaff" sound floating down from the treetops! This tiny warbler might look plain, but its two-note call is one of the most reliable signs that spring has truly arrived in Britain. Chiffchaffs are among our earliest migrant visitors, often returning before the leaves are even on the trees. This makes them easier to spot as they flit about catching insects, though you'll hear them long before you see them. Listen for that distinctive rhythm - it's actually how