Osprey Species Dossier

by Carl Strang

This dossier centers on a couple days from my kayak circumnavigation of Isle Royale, when weather compelled a 2-day stay at Hay Bay. It proved to be a highlight of the trip, and I learned most of what I know from experience of moose and ospreys during that stop. Otherwise, my knowledge of ospreys consists of limited snapshots of observations.

Osprey

Osprey

Osprey

I saw ospreys regularly over the Tippecanoe River, in Indiana, in summer in my childhood and early teens, but then they declined. By 1970, ospreys had become rare enough that a sighting in fall at Hawk Lake was remarkable. Then we saw some at Assateague Island, Virginia, occasionally carrying a large fish in their talons or catching one from the water’s surface. They had large nests of sticks there and on buoys in the Eastern Shore area of Maryland.

Osprey nest on buoy, Chesapeake Bay

Osprey nest on buoy, Chesapeake Bay

4SE88. Osprey flying south along the Fox River between North Aurora and Batavia, Illinois, at Red Oak Nature Center.

18AU96. Hay Bay, Isle Royale National Park. At around 12:30 an osprey appeared, coursing over the bay at 30-50 feet of altitude. After about 5 minutes it dove from more than 30 feet and plunged into the water, catching a good-sized, silvery looking fish (appeared to be about as long as the bird’s wing width). With much effort the bird flew up to the ridgetop across the bay. Between 3 and 3:30, two ospreys hunted over the bay, one started a dive but aborted, one after the other drifted over toward the bay entrance. They returned around 4:00, one perching on a tree and calling with loud, high-pitched chirps. The other aborted several dives and completed one in the 10 minutes I watched, but caught nothing. By 5:00, water had greatly calmed in Hay Bay. An osprey with a fish landed in trees back from shore, opposite me. A few minutes later one flew over the bay while another called. At 5:30 an osprey flew over camp with a fish. By then it was clear that there were 3 individuals, one possible youngster calling while the other two hunted. One successful catch, a larger fish, was carried out of view. Those plunges are dramatic, the birds highly specialized. Try to talk politics with an osprey, it’ll just say, “What’s that got to do with catching fish with your feet?”

After catching a fish, the osprey turns it around head first for easier handling in flight.

After catching a fish, the osprey turns it around head first for easier handling in flight.

19AU96. Hay Bay. Ospreys were hunting by 7:30 a.m. Their ker-plooshing plunges are audible at some distance. I saw an osprey catch a good-sized fish. “Kibitzing” calls increased from a bird on shore, but then it flew out and I saw that it had a fish, too. Both flew toward the ridge across the bay, but carried their fish up and over it. Around 11 a.m. an osprey hunted the bay for a good 20 minutes, with few dive attempts. It hovered in place 2-3 seconds a couple of times. On the third complete plunge, it caught a fish and flew with it in the same direction that the two went earlier. Much calling by another, perched bird during the first half of that hunt. 2:00 decisions, decisions: do I watch the moose feeding or the osprey hunting? The osprey dove close enough to me that I could see how it holds its feet up by its head. A miss. They always shake water off in mid-air, a few wing beats after clearing the surface. 3:00 There are at least 4 osprey, all at the bay now. 5:00 An osprey caught a good-sized fish (half its length), and carried it in the same direction, followed by another, fishless bird. Ripples only, still, in the bay.

16AP00. Willowbrook. An osprey flew over, SW to NE, with a fish in its talons possibly caught in one of the ponds at the College of DuPage campus.

19AP01. Willowbrook. An osprey flew over with a large goldfish in its talons. I’m not sure what direction it was coming from, possibly north.

2009. Tri-County (JPP) State Park. Ospreys nested atop the very high utility pole at the boundary of this park and Pratts Wayne Woods Forest Preserve.

Osprey nest, James Pate Philip State Park

Osprey nest, James Pate Philip State Park

2009-12. In most springs an osprey has spent some time (most of a week at times) at Mayslake, perching on trees at the edges of the lakes and occasionally fishing.

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