[NatureNS] migration altitude question

From: "Heather Drope" <heather.drope@ns.sympatico.ca>
To: naturens@chebucto.ns.ca
Date: Wed, 23 Apr 2008 13:33:37 -0300
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The son of a friend of mine was flying, not solo yet, and he and the 
instructor found themselves headed into a flock of white birds at an 
altitude of 3,000 feet. They dove to try and keep the damage to minimum, 
which they did. They survived.
The question is - do different species of birds fly at different altitudes 
when migrating? Is it always the same or what determines it?
The next burning question is - do birds migrate at  night in huge flocks?
Hope someone can answer these questions... Heather D.

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