The Long-tailed Skua is a medium-sized seabird and our smallest skua. It is the size of a black-headed gull, with slim wings and delicate tail streamers. It is greyish above and dusky below with a pale breast. It has a dark cap on the head and has a dark bill. Juvenile birds are greyer and more stripey than young Arctic and Pomarine Skuas, but are tricky to identify. It's a passage migrant to the UK, breeding in the high Arctic. Good numbers of birds spend the winter off west African coasts and off Brazilian and Argentinian coasts.