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Wren Troglodytes troglodytes L 9-10cm. Tiny, dumpy bird that cocks tail upright. Unobtrusive and often creeps through low vegetation. Call is distinctive. Sexes are similar. Adult and juvenile have dark reddish brown upperparts with barring on wings and tail. Underparts are greyish white with buff wash to flanks; note striking, pale supercilium. Bill is needle-like and legs are reddish. Voice Utters a loud, rattling alarm call; warbling song ends in a trill. Status Widespread resident of all sorts of habitats with dense undergrowth.