A Great Horned Owl aggressively attacked Iris during the night, knocking her off the nest and into the dark night skies. While the owl remained on the edge of the nest, an osprey (presumably Iris) made several swoops at the owl, eventually convincing it to depart the nest. We could see the shadow of Iris as she returned from across the parking lot, and after perching and alerting using a more rarely heard, almost mechanical/duck-like high-alert vocalization, she settled back into the nest, remaining alert for some time after.
Usually Great Horned Owls aren't a threat to an adult Osprey, but they are known to prey on nestlings. Only time will tell if the owl continues to probe Iris' defenses as the incubation period continues, and we're hopeful that Iris' stalwart defense of her nest and her formidable size will convince the owl that this nest isn't worth the attention.
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This Osprey nest is at the mouth of the spectacular Hellgate Canyon at the edge of Missoula, Montana. It’s in a very busy location, right outside the Riverside Health Care Center and next to busy parking lots, a construction site, a busy highway, and a railroad. However, it’s also an ideal location in many ways, since these Ospreys have riverfront property only about 50 feet from the Clark Fork River. Being so close to people does not bother them, and hundreds of people enjoy watching them every day.
The female Osprey at this nest is called Iris because she has very distinctive spots on her iris, especially in her left eye. These iris patterns serve as individual barcodes and allow us to identify her. She has nested at this site for many years. Her mate of many years, Stanley, did not return in 2016, and she attempted to breed with a new male dubbed "Louis" after an influential local Salish elder named Louis Adams (for more info: [ Ссылка ])
After a single year of successful breeding with Louis in 2017, Iris went through several years of unsuccessful attempts as Louis paired up with another female a little downriver. Then, in 2024 a new male showed up (later christened "Finnegan" by viewers) who successfully paired with Iris and began a new breeding season.
Ospreys are consummate fishing birds, and this pair fishes primarily from the Clark Fork River and nearby Rattlesnake Creek. They use their 6–7 foot wingspans to soar above the water, looking for fish, then diving as deep as 3 feet for shallow-swimming prey. Adult Ospreys usually weigh 3–4 pounds, and they can carry prey up to 50 percent of their own weight. Ospreys can live up to 25 years, and they typically lay 1–4 eggs in a clutch.
The nest used to be on a power pole about 200 feet west of where it is now. This was dangerous, since the Ospreys could have been electrocuted, causing fires and power blackouts. In 2007, the current nest platform was erected to provide a safer place for the Ospreys to nest. They took to it immediately. Getting the new nest platform set up, and installing and running to high resolution camera for this feed for you to enjoy has been a large effort involving many groups: Riverside Health Care Center, Karen Wagner, Kate Davis and Raptors of the Rockies, Northwestern Energy, Dave Taylor Roofing Company, and Dr. Erick Greene of the University of Montana.
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