The Blue Jay (Cyanocitta cristata) grows to approximately 11 inches in length with a wingspan of about 16 inches. They are common and widespread in woods, and travel in small groups or pairs. Their diet consists of insects as well as acorns, other seeds, and also bird eggs and nestlings. Their bright blue wings and tail, blue crest and black "necklace" make them unmistakable. They construct their nests in trees of twigs, bark, leaves, and human-made objects, lined with fine rootlets. Blue Jays are unique among American jays in that they migrate regularly in autumn, when flocks of hundreds move southward on the coast and through mountains in the East.Their call is a shrill, descending "jaaaaaaaay".