Sparrows just naturally sprout all manner of lovely accessories such as their necklace of ruby feathers, but they can't change their jewelry for such special occasions as, say, a night on the town splashing in the fountain at Washington Square, taking in the sights and snacks at the local birdfeeder or jet-setting south along the Atlantic Flyway. We humans, on the other hand, have endless opportunities to switch out our feathers to suit the occasion. Hence, Ruby Throated Sparrow. Feathers for Sparrows, Necklaces for Humans.