May is the prime month across much of North America to celebrate the return of migratory birds from the tropics. Of all those coming back, it is the warblers that many birders eagerly await. And of the more than 50 species that brighten our spring, many gleam like precious stones. From the sky-blue of the Cerulean Warbler to the golden cloak of this Prothonotary Warbler, these tiny birds dazzle us.
