Songbird migration northward peaks in late April to early May. Duck Inn Trail is one of the best trails on the refuge to look for migratory warblers, thrushes, kinglets, and more. Deer fawns are born in late May and fawns encountered in the woods and fields after that time are not orphaned, but are hiding from predators. Their mother will return for them soon.
Look for osprey nests on platforms situated atop utility poles around the refuge. Their eggs also hatch in late May. Barn swallows return to their nests under the roof of the porch at the refuge office, and bluebirds and tree swallows establish territories at bluebird nesting boxes around the refuge. Throughout June, breeding bird species can be heard singing throughout the refuge, along trails and roads.
In June, young eagles are learning to fly and will fledge from the nest in July. Throughout the summer, the barn swallows at the refuge office provide a close-up look of nesting birds for visitors.
Butterfly numbers and diversity reach their peak on the refuge in July. The native plants in the BayScape garden at the refuge office and along the BayView Butterfly Trail attract these winged beauties in high numbers. Zebra swallowtails, black swallowtails, and American ladies are among the more common species. The water garden in the BayScape will be "hopping" with leopard frogs.
In August, ospreys may start their migration south while blue-winged teal, the earliest waterfowl migrants, being to arrive from their northern breeding grounds.