When people see the large nest inside the Dickinson County Nature Center and the big raptors on the outdoor nest during the summer, they often think they are bald eagles.

Many people don't realize that after being extirpated in Iowa, osprey populations have started to make a comeback in the 2000s. Each summer, osprey come to Kenue Park to nest and raise their chicks before heading south for the winter.

(Read where the osprey go in the winter.)

Even after learning about osprey, people have trouble telling the difference between them and bald eagles. Other than their coloring being different, there are seven other key differences between osprey (Pandion haliaetus) and bald eagles (Haliaeetus leucocephalus).

1. Size: Osprey have an average 59- to 70-inch wingspan and weigh 3-4 pounds. They have long, narrow wings with a marked kink that makes them look like an M-shape from below.

Photo of an osprey from below

The bald eagle is one of the largest birds in North America, with an average 80-inch wingspan and weighing 6.5 to almost 14 pounds.

2. Diet: Osprey eat a diet of about 99 percent fish, usually 4-12 inches long. The type of fish varies depending on where in the world the osprey lives, but the osprey in Okoboji seem to enjoy panfish and the occasional koi from a local water feature.

(See a video of the Okoboji Osprey eating koi here.)

Bald eagles love fish as well, and sometimes rather than doing their own hunting they will harass osprey, making them drop their fish or even steal their fish right out of their talons.

Bald eagles also eat birds, reptiles, amphibians, rabbits and muskrat, both live or as carrion. They sometimes gorge on food and digest it over several days, and they can also survive fasting for many days or even weeks.

Beak: An osprey's beak is black, short and has a sharp hook that helps it tear into fish to eat.

Photo of an osprey chick

 

Bald eagles have a yellow beak which is also hooked for tearing into flesh.

Photo of a bald eagleTalons: Osprey have extremely long, curved and sharp talons that help them grip the fish they catch. Their white feet have spiny scales, and they also have four equal toes. The outer toe is reversible, allowing the osprey to hold its fish aerodynamically when it flies.

Photo of osprey talons

Eagles have giant talons on their first and second toes that give them a secure grip on struggling game. They also have yellow feet.

Special abilities: Osprey can dive about three feet into the water to catch fish, and they can dive both head and feet first. They also have the ability to take off straight from the water instead of having to swim to shore.

Sometimes bald eagles hunt cooperatively, with one individual flushing prey toward another.

Nest: Osprey nests are built of sticks and lined with bark, sod, grasses, corn stalks and other softer materials. Most nesting platforms are about 5 feet wide and a foot deep. However, it has been seen that osprey who nest in the same place year after year have ended up with nests 10-13 feet deep and 3-6 feet in diameter.

Osprey also like to nest in open areas, usually built on snags, treetops, cliffs or human-built platforms, cell phone towers or light towers.

Photo of an osprey sitting on a nest

Bald eagles nest in trees, usually conifers, and create huge nests --- 5-6 feet wide and 2-4 feet deep --- out of sticks lined with grass, moss or corn stalks. Nests can take up to three months to build. Bald eagles typically build near the trunk of a tree, high but not at the crown like osprey. Some eagles also nest on the ground when necessary, using kelp or driftwood for construction near coastal shorelines.

Photo of a bald eagle nest

Chicks: Osprey typically lay 1-4 eggs once per season. Eggs are cream-colored and spotted with reddish brown dots. The incubation period is 36-42 days, and the chicks usually fledge within 55 days.

(Read about the 2017 chicks fledging here.)

Bald eagles lay 1-3 eggs once per season. Eggs are dull white, usually without markings. The incubation period is 34-36 days, and chicks stay in the nest 56-98 days.

(Watch the live osprey web camera April-September. In the off season, watch the trumpeter swans on the Kenue Park wetland.)

Osprey breeding season timeline

Spring is coming, and that means that we starting looking for the Okoboji osprey to return to the nest in Kenue Park. They are amazing creatures that follow a strict schedule, and you can almost set your watch by them. Here is a quick timeline of the typical osprey year: April 2: After overwintering in…

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In the movies, you have probably seen a bald eagle flying and heard a screech-sound effect. However, that’s actually not a bald eagle’s call (hear that here). You may have also seen an osprey flying overhead in the movies and heard the same call, or a golden eagle and heard the same call. Film production…

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Osprey maze

Osprey are unique raptors that are built to eat fish, in fact, it’s 99 percent of their diet. Click on the image below for a free printable osprey maze activity that you can challenge yourself with at home. Read more about osprey at these links: WATCH: Osprey lifespan Seven differences between osprey and bald eagles…

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Watch the Okoboji Osprey lifespan

From migrating north to reproduction and caring for chicks to migration south, the osprey lifespan is fascinating! Don’t forget to download the Okoboji Osprey Activity Book complete with word search, dot-to-dot and Migration Mad Libs. Click here to access the free activity book.

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Okoboji Osprey free activity book

Click on the image to download our special Okoboji Osprey activity book for free and then click here to watch the osprey live April-September on the nest cam.  

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11 Comments

  1. M Joy Vitale on June 21, 2020 at 4:53 pm

    We retired to Upper Michigan. We see bald eagles once in a great while flying near our Lake Michigan shoreline, and osprey when we rented a condo in the Keys – amazing. The osprey were easy to spot with their splayed feathers.



  2. Deborah on May 13, 2020 at 11:54 am

    how do ospreys with hatched young clean the nest? No fecal sacks and I see the one in Richmond rooting around in the nest with her beak but the babies are too young to go over the edge, if that is what they do…



  3. Melinda on April 30, 2020 at 2:35 pm

    Either a bald eagle or osprey flew into a picture. Also that’s visible is the black outline from underneath. Do you have any tips or comparison pictures? I have it posted on my website and would like to name it appropriately. Thank you. realtor-melinda.com



    • kiley on April 30, 2020 at 2:38 pm

      An osprey has a distinctive crook in its wings while flying. Osprey also have more white underneath than a bald eagle would. Hopefully that helps!



  4. David on April 20, 2020 at 2:08 pm

    Thanks for this succinct information.

    Recently I watched an osprey hunting and was surprised to see it dive almost vertically into the river and come up with a fish. (At that point, two bald eagles swooped in from the trees and tried unsuccessfully to steal the meal.) Was the osprey’s dive unusual behavior?



    • kiley on April 20, 2020 at 3:47 pm

      That would be typical osprey behavior.



    • E Berry on April 20, 2020 at 5:25 pm

      I think it is typical, as was already said. I also think it is typical for eagles to let the osprey catch fish and then try to steal the meal rather than fishing for it themselves. A local ranger told me that the eagles are often successful in stealing the catch and the osprey has to hunt once again for their own mean.



    • Vince DeBari on May 10, 2020 at 2:09 pm

      No, I’ve seen Ospreys catch fish by making fast vertical dives.



  5. Ruth Scott on September 13, 2018 at 8:32 pm

    I love your site very informative Ruth



  6. Joel Nett on September 3, 2018 at 11:54 am

    Is it true that osprey will only nest in an area that has open water year round.
    Also how close does the open water have to be relative to the location of the nest.

    I have a pond behind my house with very small fish in it (large goldfish, 4′” or less) and it is froze over about 5 months of the year. The nearest lake with open water is about five miles away.
    I’d love to create a platform on a pole to possibly lure an osprey to build a nest. Would I be
    wasting my time?



    • kiley on September 4, 2018 at 8:31 am

      It depends on where you are in the country. In Kenue Park, the osprey are here April through the beginning of September, and that is when there is open water here. Also, they fly a mile or two to the lakes to fish, because the nearby wetland (close to the nest) does not have fish in it. They still like the nest here.