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Blackcap - Sylvia atricapilla - female. L 14-15cm. Distinctive warbler with a musical song. Sexes are dissimilar. Adult male has grey-brown upperparts, dusky grey underparts, palest on throat and undertail, pale eyering and diagnostic black cap. Adult female and juveniles have grey-brown upperparts, pale buffish grey underparts (palest on throat and undertail) and reddish chestnut cap. Voice Utters a sharp tchek alarm call. Song is rich and musical warble; similar to Garden Warbler’s but contains jaunty phrases. Status Common summer visitor to deciduous woodland with dense undergrowth, scrub and mature gardens. Migrants from N Europe pass through in autumn and some remain throughout winter.