Bald Eagle

Bald Eagle

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Bald Eagle Migration Update: April 13,2005

Today's Report Includes:


Today's Map and Data
The migration is on!

The migration is really heating up with some of the eagles moving into Canada this week.

Study their activity on our map or make your own with this week’s data.

 

Mature Eagles
Juvenile Bald Eagles
(Fledglings)
 

 

 

 

 


Field Notes from Peter Nye
Hello Eagle Trackers:
Spring continues its warming march here in New York, and our eagles continue their moves.

Canada Bound
Migrants P04 and V98 continued north this week. P04 has moved out of northern NY and into S. Quebec, answering that nagging thought that he might be a NY nester: NOT! Now, we sit back and see how far he will go. V98 has also now moved north out of NY. Of course, from last years data, we know where V98 is going (right?). You could also look back and see if her current location was along her 2004 route north.

V98 locations
April, 2004
V98 locations
April, 2005

Fledgling New
Our four fledglings continue to show some interesting movements. Y89 seems to like southeastern NY and has so far shown no inclination to move back toward her

Incubation in progress. Shhhhhh...don't disturb!
credit Lou Busher

fledging area, like Y90, who as of 11 April was back near her nest site; it will be interesting to see how long she stays around there. Y94 is interesting. Two weeks ago Y94 was in central PA; last week she was up in central NY, and this week she appears to have dropped south into PA again, along the Delaware River south of Philadelphia. Thankfully, Y96 finally moved out of Maryland and north back into NY, apparently on our Hudson River where we have numerous eagles. These youngsters certainly do not seem afraid to move around, which is very likely all part of their learning process.
Here is a shot taken by one of our volunteers, Lou Busher, of one of our active nests (taken with a long lens from a safe distance away).

This is about all you see of an incubating bird. Can you tell what kind of tree this is?

Talk to you next week. Stay tuned!

Eagleye
New York State Dept. Environmental Conservation
Delmar, NY


Compare and Contrast
Study V98 on the migration maps from April 2004 and 2005 to answer this question:

Challenge Question #18:
"How would you compare V98s April migration pattern in 2004 with 2005? Describe the similarities and differences. Why do you think V98 is migrating in this pattern?"

(To respond to these questions, please follow the instructions below.)


Real-life Stories: How's Your Story?
Last week we challenged you to write a story about a juvenile returning to its old nest site. What happened to your bird?

What really happens in this situation? Eagleye Nye shares some real-life situations:

Time to Celebrate, but Hold the Cigars
At the Northeast Utilities Eagles OnLine nest site in MA were proud to announce that an eaglet has hatched!
"The chick hatched on Saturday, 4/9/05 morning. The parents have been supplying the nest with plenty of fish and the chick has been eating."
2 proud parents- which bird is most likely sitting on the egg?
One new Bald eagle hatches from the egg 04/09/05.

Take your first glimpse of the proud parents and the little chick, and visit their site often to watch the progress of raising this young bald eagle:

Eagle Chore Chart
In order to have Bald Eagles in the future, Bald Eagles living today have to reproduce. This involves a LOT of critical steps, and scientists are still trying to figure out a lot of the details.

Did You Know
Both male and female eagles form a brood patch--a bare spot on their tummy where they can press their hot skin directly against the eggs or chicks to keep them warm. And, sometimes when the parents leave the eggs, they cover them with feathers and nesting materials.
Learn more about how these fascinating birds successfully raise their young.

Even though it's not written down anywhere, male and female eagles know exactly what their duties are when it comes to raising young. Take some time to view the list of duties that each of the parent needs to do to successfully raise their young. Print a copy of the chart, then record each duty listed in the proper column of the Chore Chart for Raising Eagles.


Adaptations Review
An ornithologist seeing an eagle for the first time could instantly guess that this bird is a predator, it probably catches fish by plucking them from the water with its feet, it flies long distances without a lot of flapping, nests in trees, and mates for life. Now you too have learned many of the fascinating adaptations about the eagles body--and its behavior and how they are adapted to their environment.

Review what you have learned so far this season:


The Wind Beneath Her Wings: Review CQ #15
On one day of migration Bald eagle V98 chalked up the miles. The day before April Fool's Day how far and fast did she go??
We calculated that she flew 11.76 miles/hour that day!

Here's how we calculated - did you get the same result?
First, we plugged the coordinates into the Distance Calculator (http://www.indo.com/distance/) to find that the distance V98 flew was 68 miles.
Next, we calculated the amount of time it took the bird to fly this distance, (5:47:02 = 5 hours, 47 minutes and 2 seconds = 347 minutes).
Finally, to calculate the speed we divided 69 miles by the time (5:47:02).

69 miles
--------- = 0.196 miles/minute = 11.76 miles/hour
347 minutes


Young Eagles' Gender: Eagleye Responds to CQ #16
Eagleye sometimes refers to the eaglets' gender in his Field Notes, but eaglets - like adult Bald eagles - look very similar. What did you find out about juveniles?
Students at Iselin Middle School in Iselin, NJ were on to this.

"We think that scientists are able to determine a young bird's gender by using the same formula they use to determine the sex of the adult birds.
sex = (bill depth X 0.392) + (hallux length X 0.340) - 27.694"
They also wrote, "You can tell the different genders by looking at the size because females are roughly one third larger than males."
-Nice work, Bhavini, Bridget, Michael, Ihtisham, Stephanie, James, Nicole and Felicia

Wait - Check out the 8th Primary Feather
Actually, one of the researchers items on the check-off list for each nest site includes taking some measurements to determine the sex of the youngsters. Eagleye uses his years of experience to decide the gender using the same calculations mentioned above.
He writes, "There is also a scientific method deduced by Gary Bortolotti (paper published 1984), where age of nestling is determined by measurement of the 8th primary feather, then age used to determine sex by measuring the bill depth and foot pad length."

* Extra Credit *
Can you find this paper and read about Bortolottis work?


Bald Eagle Adaptations: Talons - Challenge Question #17
Challenge Question #17: "What's the difference between claws and talons?"

Mrs. Watson's 3rd grade class from the Belmont Day School made a thorough investigation! Here is their response:

"The talons are strong and sharp. Claws are sharp too, but they can't carry things. So a cat carries things with its mouth, and an eagle carries things and food with its talons. Talons are much bigger than claws. Animals with claws use their teeth to tear food a part, and eagles use their talons to tear food a part. Also the talons are much stronger than claws because eagles carry their food to their high-up nests, using their talons."

Great job!


Eagle Glossary
Build your vocabulary with terms used in our reports as we study eagles this season. Find the following terms from this weeks report and define them in your eagle journals or portfolios: brood patch and talon.


How to Respond to Today's Challenge Questions:

IMPORTANT: Answer only ONE question in each e-mail message.

1. Address an e-mail message to: jn-challenge-eagle@learner.org
2. In the Subject Line of your message write: Challenge Question #18.
3. In the body of EACH message, answer ONE of the questions above.



The Next Bald Eagle Migration Update Will Be Posted on April 20, 2005.

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