[Tweeters] Birds bobbing heads

[Martha Jordan via Tweeters]

Stabilization is also found in flying birds. It is more easily seen with
long necked birds like swans or cranes:  they keep their head still and
move around it with their body in flight.
Having gotten to be close to a trumpeter swan flying beside a power boat
(swans trained to fly next to or over the boat), it was really fascinating
to watch the movement of their neck and bodies while the head remained
really quite stable.

Martha Jordan
Everett, WA
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