Date: 7/6/17 10:08 pm
From: Robert O'Brien <baro...>
Subject: [obol] Astronomical Ravens
Craig Miller recently posted an astounding Ravens photo he took in central
Oregon:
http://birding.aba.org/message.php?mesid=1306340&MLID=OR01&MLNM=Oregon

He found a flock of 106 of these birds in the air together.
Now, 106 Ravens in a single flock isn't astronomical. I've seen similar
numbers there a time or two.
It's what they were doing that was astronomical.

Now most birders know that birds regularly fly long distances at night
while navigating by the stars.
But how did they learn to do this? Well Craig has happened upon the answer.

http://ebird.org/ebird/view/checklist/S37912427

You might think that they would have these lessons at night. But of
course, they can't see each other then
because they're black. So they have to do them during the day. In Craig's
photo they're still learning of course.
They don't have the pointer stars (pointing at the north star) quite right,
and they may not know about the
double star in the middle of the handle. But the season is still early and
there's plenty of time to learn more.

Nice, ground-breaking research Craig.

Bob OBrien

See Craigs's photo attached.

 
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