Common Raven, a member of the corvid family, is arguably one of the most intelligent birds in the North Hemisphere. Once common in the eastern US they disappeared by the 20th century, primarily due to forest clearing. In recent years they have begun returning to New York City and Long Island, with pairs nesting in Manhattan and Brooklyn. Often heard before they are seen, they have a distinctive, deep croaking call. Learn more about raven intelligence on this PBS website.