Eastern Bald Eagle Migration Update: March 7, 2000
Field Notes from Peter Nye How Much Do Our New Eagles Weigh?
The Journey North Begins! "It looks like K58 has already started to boogie! This eagle left early! The March 3 fix puts K58 up in central ______ and two days later up in ______.
(To respond to these questions, please follow
the instructions below.) How Can You Tell Male and Female Eagles Apart? "In many bird species, it's easy to tell males from females because the plumage is different. Not so with eagles! We can use weight and size to tell them apart---but when we talk of bald eagle weights, we need to keep two factors in mind: Here are the key measurements from our two new eagles, plus their weights. Can you determine the sex of each
bird yourselves?
(To respond to this question, please follow
the instructions below.) Do Eagles Migrate at the Same Time Each Year? As you know, this is not the first satellite-tracked trip for Eagle #43, #F81 or #F83. Peter Nye tracked all 3 birds last spring--and Eagle #43 is about to begin her 3rd trip under Nye's watchful eyes. Do you think the timing of an eagle's migration is the same every year? Do you think an eagle follows the exact same route each time it travels? Print a copy of this Spring Departure Chart, then take a look at Nye's data for these 3 birds from previous springs and plot the departure dates for each bird:
Predictions Please: Challenge Question #9 Now make your predictions!
(To respond to this question, please follow
the instructions below.) Suggestions for Student Research With Satellite Data How might you design a study of your own using this migration data? Make a hypothesis, then compare and contrast the data from each migration. At the conclusion of your study, write a scientific paper.
Home on the Winter Range Discussion of Challenge Questions #4 & #5 Challenge Question #4 asked, "What is the greatest distance between two points that each eagle had visited in the past 3 weeks?" Here are the distances:
Congratulations to Timmy F. for measuring these distances accurately. He noticed that each eagle moved about 40 miles. Except for Eagle F81 whom he said, "Doesn't seem to care where he is going!". Timmy also answered Challenge Question #5: "How does an eagle's winter range compare to your own? What are your reasons for moving? Why do you think an eagle moves around within its home range." "My family has a 16 mile north/south and a 8 mile east/west range. Sometimes we take short trips up to 1000 miles. We don't move around very much. The eagles have a larger range about twice as far as ours except for F81 that has traveled 120 miles. We move because we have to do stuff like go to games, buy food, go to school, and go to scouts. An eagle moves because he has to hunt and go to his day roosting tree and visit other eagles." "Very perceptive!!" said Nye. (We sent Timmy's answer to Eagleye Nye.) Watch for Weekly Updates During the Migration While the migration is underway, we'll post updates every Thuesday so you'll have the latest news. How to Respond to Today's Challenge Questions Please 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 #6 (or Challenge Question #7, #8 or #9) 3. In the body of EACH message, answer ONE of the questions above. The Next Bald Eagle Migration Update Will be Posted on March 14, 2000. Copyright 2000 Journey North. All Rights Reserved. Please send all questions, comments, and suggestions to our feedback form
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