Absolutely it is the St. Louis Scarecrows. Not only is St. Louis the closest team geographically to the Falcons it also has held a lot of animosity between the two teams going way back into history. To bring up history that myself knows, The Scarecrows and the Falcons had ferocious battles back in the late S10s and early S20s when both teams were managed by legendary manager Esa (Detroit) and JP (St. Louis). Around then STL and Detroit would fight tooth and nail to make the finals in the conference finals every year. Since then, partnered with being in the same conference, these teams have had fighting battles for almost 50 seasons, basically since STL came into the league. Detroit holds the higher ground being an older and more storied franchise. St. Louis is newer (though not by much) and has had less success. Really they are like the younger brother Falcons, so go Detroit fuck the Crows