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Migration
Update: April 22, 2009 |
Welcome
to the 2009 Journey North Bald Eagle Study! |
An eagle feather: illegal to own, but fascinating
to look at >> |
Maps
and Data |
The
bald eagles seem to have one thing in mind; their nesting grounds.
U25 continues to amaze with her straight, no-fooling around approach
to migration. It is interesting to compare her with U21, the other
bird still migrating. We will look more closely at U21's map in
this week's handout.
Eagle
U25 appears to be following the same path she took in spring 2007
and 2008. Like U21, she flew about 750 miles between March 28 and
April 15.
Which
eagle will be next to arrive at their 2009 nesting site? Make a
prediction and then return next week for an update.
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Questions about this week's map >>
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Observation:
Eagle Nesting Behavior |
Here's
an interesting question that missed the deadline for Ask the Expert:
"I
have observed the same pair of nesting eagles for the past 3 years.
This year the pair has a 3rd mature eagle that sits on the same
branch with the parent who is not in the nest. I thought they
protected their area from other eagles. Is this unusual? Or, have
I just never seen it before?"
What
do YOU think is going on here? Why would a mature eagle be hanging
out at an active nest site? We put the question to Peter Nye. Here
is Pete's response:
"That's
not a good thing! By maturity, such birds are a threat to both
any young in the nest, and perhaps to one of the breeding adults.
Perhaps the bird is looking to take over their territory. Usually
the resident adults are protective and drive off such eagles,
but some don't do much for some reason, and end up losing."
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A
typical family: Adult + 2 fledgling eagles
Credit:
Ray Foster |
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A
typical family: Hanging
out
Credit:
Ray Foster |
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Explore:
Focus on Feathers
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When
you see a bird and notice they have a missing feather or two, what
is happening? Does this mean the bird is sick? Or, has been damaged?
Read this week's slideshow, look closely at feathers, and learn
about something called "molting."
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Focus:
Norfolk Eagle Nest |
The
Norfolk Botanic Garden eaglets are well, and growing! They are scheduled
to be banded on Wednesday, April 22. At this time the biologists
will weigh and measure the eaglets, take a small blood sample, and
a single feather to collect a genetic sample.
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Norfolk
Botanic Garden Eaglecam >>
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Banding
allows scientists to collect information about wild birds. Each
band carries a code number that is reported to the Bird Banding
Laboratory at the United States Geologic Survey’s Patuxent
Wildlife Research Center. A bald eagle leg band is made of metal
and will last throughout the bird’s lifetime.
Nestcams
continue to teach us more about eagle nesting behavior.
Tune in often:
- Norfolk
Botanic Garden Eaglecam >>
- Sutton
Center Bald Eagle Nest >>
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Links:
This Week's Eagle Resources |
- Active
NestCams:
- Cornell
Lab of Ornithology >>
- Sutton
County >>
- WVEC
Norfolk Botanical Garden >>
- Explore:
A Closer Look at Maps >>
- Eagle
Glossary Words: eaglet, banding, genetic sampling >>
- Lessons,
Activities, and Resources >>
- Journey
North for Kids:
Eagles >>
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Eagle
Journal >>
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The
Next Bald Eagle Migration Update Will Be Posted on April 29, 2009.
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