Many of the most obvious nicknames are based on nothing more than the color of the team's jersey. Take, for example, the city of Liverpool. There are two teams who have played in the top division of English football for the majority, if not all, of their existence. The connection between ornithology and North American professional sports is most visible in the National Football League, where five teams have bird names. The NFL is the place to be if you enjoy the Ravens, Eagles, Falcons, Cardinals, and, of course, the Seahawks. Coach Chuck Knox's cautious, ball-control offense is known by this moniker. The Philadelphia Eagles are known as the Iggles. Homeland Defense: The New England Patriots' defense during their Super Bowl XXXVIII and XXXIX campaigns. The offensive line of the Washington Redskins of the 1980s was known as the Hogs. The moniker given to the 1977 Atlanta Falcons defense, which was directed by defensive assistant Jerry Glanville and allowed the fewest points per game (9.2) in NFL history. Ground Chuck is Coach Chuck Knox's cautious, ball-control offense. The Philadelphia Eagles are abbreviated as the Iggles.