Sometimes you've just got to stop everything, get out a lawn chair, and see what treasures the big blue sky pours down on you. For birders, mid-September is one of those moments! Broad-winged Hawks are migrating en masse to South America, with hundreds, sometimes thousands of birds circling up together in huge rising columns called kettles. This is a spectacle you simply must see to believe, and this weekend in September should be the prime time. We'll start the day with a short hike to the viewing spot: a blueberry field on the side of Crotched Mountain in Greenfield, NH. The views from the platform here are excellent, with some birds skimming right over our heads, heading south. In addition to many species of hawks, Bald Eagles, Ospreys, Kestrels, Merlins, and many other raptors will likely be seen. Bring a bagged lunch, water, and good walking shoes, and plan to spend a few hours scanning the skies. The more eyes we have, the more birds we see! Meet at the trailhead just off Crotched Mountain Rd. in Greenfield (see map) at 9:00 a.m.