the dartford warbler ("sylvia undata") is a typical warbler from the warmer parts of western europe and northwestern africa. it is a small warbler with a long thin tail and a thin pointed bill. the adult male has grey-brown upperparts and is dull reddish-brown below except for the centre of the belly which has a dirty white patch. it has light speckles on the throat and a red eye-ring. the sexes are similar but the adult female is usually less grey above and paler below.