The spring migration of adult North American Ospreys

Journal of Raptor Research
Mark S. Martell, Richard O. Bierregaard Jr., Brian E. Washburn, John E. Elliott, Charles J. Henny, Robert S. Kennedy, Iain MacLeod

Fall migration patterns of North American Ospreys have been described and studied disproportionately more than, the spring migration of these birds. We used satellite telemetry to: (1) determine the timing, duration and migratory routes of spring migrations; (2) determine if differences in spring migration patterns existed between the sexes and (3) compare consecutive fall and spring migrations of individual Ospreys.

The median dates for departure from the wintering grounds and arrival on the breeding grounds did not differ significantly between adult male and female Ospreys. Nonetheless, the male almost always arrives a few days before the female.

Compared to their fall migrations, Ospreys spent fewer days on migration, fewer days in stopover periods along the migration route and traveled farther (on average) each day during spring.

Our findings suggest that, although sex and breeding location might influence the spring migration strategy used by individual Ospreys, both males and females minimize the time spent on migration to ensure a timely arrival on the breeding grounds to establish or defend a nesting territory.

About Harriett Raptor

Eight-year-old mother of five, fluent in telepathy, a possessor of genetic memory, a genius and scholar. Harriett holds the equivalent of a PhD in philosophy, biology, chemistry, physics, astronomy, and the Homo sapiens’ concept of the humanities. Her understanding of mathematics and logic are beyond Homo sapiens’ current comprehension. Harriett is a thinker, a wise osprey, especially distinguished for her expertise in the Homo sapiens problem.

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2 Responses to The spring migration of adult North American Ospreys

Vicky says:

March 19, 2015 at 8:28 pm

And Harriet is spending time with us in Yhe Villages! She says she will be along shortly!

Harriett Raptor says:

March 20, 2015 at 1:06 am

Dear Mrs. Wade,
I thank you again for commenting on our webpage. It makes the Doctor very happy.
Now let me see; you are PRIME NUMBER 7 and your Pi digit is 1. Your comment has now made you eligible for a flavor. At the present time we only have approximately 100 flavors to choose from. However if you would like to add your own personal favorite flavor, I will ask the doctor if it is mathematically possible to include it. There’s no rush to make a decision. Thank you again for your interest in the Osprey Tales.

Harriett

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