The Northern Parula is a small songbird that is commonly found in North America. The bird has several synonyms that are used to describe it. One synonym for the Northern Parula is the "warbler" due to its habit of constant singing. Its blue-grey back and wings also earned it the nickname "blue-yellow backed warbler." The bird's small size and yellow-green chest feathers has led some birdwatchers to call it the "little green bird." Other synonyms for the Northern Parula include the "sapphire warbler" and the "canopy warbler" since it prefers nesting high up in trees. Regardless of the name, the Northern Parula is a fascinating bird to observe.