as far as the Major Leagues are concerned...there's the Baltimore Orioles, the Toronto Blue Jays and the St. Louis Cardinals.
UC Santa Cruz Banana Slugs
Baltimore, Maryland has 3 professional sports teams with the name of a bird. The Baltimore Orioles, Baltimore Ravens, and Baltimore Nighthawks. Also, Atlanta, GA has 3 professional sports teams named after birds. The Hawks (NBA), Falcons(NFL), and Thrashers(NHL).
baseball, soccer, football
Air Force and Bowling Green Falcons Boston College and Eastern Michigan Eagles Stanford and Louisville Cardinals
Most professional teams have registered trademarks for their names and colors (for that particular use) as well.
The Sooners
boilermakers
All the national sports teams has the name Romania.
The name of all sports teams is also Romania.
The Rangers
The Cornhuskers
Detroit RED Wings