Red-winged blackbirds start to sing continuously, establishing territories. Bullfrogs begin to emerge. Wintering junco numbers dwindle. Turkey vultures often return the last week. Male Leopard Frogs begin mating calls.
Bullfrogs become common.
Migrating duck species peak. White-throated swifts become common. Common snipes may be incubating by month's end. Bullfrog tadpoles are common. Muskrat young are about.