• Project FeederWatch ends this month, www.birds.cornell.edu/pfw • Spring wildflowers in bloom • Begin to monitor nest boxes after the middle of the month. • South winds bring major waves of migrating birds such as thrushes and warblers. • Osprey, Bald Eagles and hawks return. • Green Herons arrive. • Woodcocks continue their “sky dance” courtship flights. • Hummingbirds arrive. Be sure to have their feeders ready. • Purple Martins arrive by mid-month. • Buttercups, Lady’s Slipper and Trilliums join the Virginia Bluebells. • Start looking for Mayapples at the end of the month. • Lyrids meteor shower, late-April. • Earth Day, April 22.