One of the most interesting birds on St Kilda is the St Kilda wren. It is different from the wren which lives on the mainland of Britain. The St Kilda wren is a little heavier with longer wings and with a longer, thicker bill and legs than the mainland wren. It is paler and has more stripes. It has a slightly different song and lays larger, heavier eggs. All these things may help the St Kilda wren to live on wet & windy St Kilda.