This Savannah Sparrow (Passerculus sandwichensis) was one of dozens of migrants of the species that I spotted this past weekend. Their numbers are increasing as they head south for the winter. As we go deeper into autumn we will see hundreds of them in fields, grasslands and farms across large open spaces in areas like Chautauqua County or coastal scrub and shrub habitat in locations such as Stratford Point. Get those Peterson Field Guides ready! They will not all be this easy to identify…