some site said by flying at night they avoid updrafts that might push them off
course. Ingrid

(Roger Grady) wrote:

wrote:

that is true. many birds do migrate at night!! I wonder why they migrate at night
but wont fly when released. Odd.

My un-educated guess: By flying at night they may be less susceptible
to predators. I assume they depart at dusk and fly until dawn. If
disturbed at night on the ground, there are probably obstacles around
that would be hard to see and thus they're reluctant to fly.

Roger Grady
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