Funnily enough, I encountered a solitary sandpiper (life bird!) the day before by a puddle on the 10th hole of Amherst Country Club. The next day, 9/20, I saw a flock of what appeared to be 20-30 sandpipers flying (and sounding like sandpipers) over the fairway of the same hole. By all accounts they wouldn't have been solitary sandpipers in a flock like that, so I'm not sure what they were. Other than killdeers, which these weren't, I haven't observed sandpipers on the course until the last two days. Semipalmated, perhaps?