The arrival at Cape May of more than twenty shorebird species-primarily red knots, ruddy turnstones, sanderlings and semipalmated sandpipers-coincides with the horseshoe crab spawning season which occurs in May/early June.[5] Neotropical migrants—birds that spend their summers in Canada and the U.S. and their winters in Mexico, the Caribbean, Central America and South America—use Cape May Peninsula's varied habitats in great abundance during their long and difficult migrations.During this period great numbers of 17 raptor species are commonly seen including peregrine falcons, ospreys, northern harriers, American kestrels, Cooper's and sharp-shinned hawks.New Jersey State-listed species confirmed within the refuge boundary include ospreys, short-eared owls, barred owls, red-shouldered hawks, grasshopper sparrows, great and little blue herons, red-headed woodpeckers, sedge wrens, yellow-crowned night-herons, northern harriers, black rails, southern gray tree frogs, eastern tiger and mud salamanders, corn snakes and northern pine snakes.Seventy percent of the species sought by recreational and commercial fishermen depend on shallow water habitats such as those found on the refuge for at least part of their life cycle.