Some birds are present year-round, others are seasonal.
When you see a bird make at least 3 observations*, such as:
Location: where exactly did you see the bird (water, forest, field, feeder, tree top, tree trunk, lower branch, on the ground, roadside, trail side, shoreline, etc.)
Body size: compare to a known bird (smaller than a...bigger than a... plump like a...slender like a...)
Colors & markings: on wings, tail, back, belly, rump, head (stripe above, through, or below eye, eye ring, etc.)
Other: shape, length & color of tail, legs, bill (long, short, thick, thin, curved, straight) sounds or movements (travel alone or in groups, in-flight wing position--soaring, flapping, flap & glide, etc.)
*Jot down observation notes as soon as possible to help in identification.
The first spring migrants arrive in early April with the "big push" of migration in late May, when over 150 species may be present in the park at once.
Summer nesting specialties along the North Shore include Bald Eagles, Peregrine Falcons, many wood warblers, and more.
During fall look for the Common Nighthawk migration in late August, when thousands can fill the sky on warm evenings; the flood of songbirds heading south in early September; the peak of raptor migration in September and October, when the North Shore is one of the best places in North America to see migrating hawks; and the Arctic birds beginning to arrive in late October.
In winter, northern owls and winter finches such as redpolls, crossbills, Pine Grosbeaks, and Evening Grosbeaks sometimes visit from Canada.