"Size: 11-12 cm (4-5 in)"
"Often described as “tiny,” “dainty,” or “delicate,” the Northern Parula (pronounced PAR-a-la or PAR-ya-la) is one of North America’s smallest wood-warblers. Originally named Finch Creeper by Mark Catesby and Blue Yellow Back Warbler by J. J. Audubon and Alexander Wilson, this handsome blue-gray, yellow, and white bird can be found breeding throughout the eastern half of the United States and in southern Canada from Manitoba to the Maritime Provinces. It winters primarily in eastern Mexico and on islands of the West Indies."

http://bna.birds.cornell.edu/bna/species/215/articles/introduction