Vocal and plumage variation in the Bewick’s wren is extensive ... gray-white below, with long, pale supercilium. White-tipped tail has black bands. Juvenile: plumage subtly paler than adult ...

Ultraviolet light waves flashing from the wren's cheeks can't be seen by humans, but are detectable to a bird's eye. The spectacular colouring of the males and their curiosity is what first drew ...