I’m a bona fide bird geek but you don’t have to be like me to enjoy the thrilling spectacle of swirls and swaths of Purple Martin tornadoes swooping into the city to roost. Take a moment out of your evening to head down to the 17th Street Farmer’s Market just before sunset and take it in. At 17th and Franklin you’ll probably notice a skygazing crowd and you’ll know you are in the right place. Prepare to be regaled and while you might be astounded by the lovely visage, do try and keep your mouth closed. Next month the Purple Martins are migrating to South America so don’t delay.