"John R. Copeland" wrote in message
...
I've heard of migratory birds being seen *above* clouds,
but I've never heard of them being seen *in* clouds.
Could that be simply because they're hard to see in IMC?
I'm more comfortable hoping they just don't fly there.
I've noticed daytime birds are extremely uncomfortable flying at night.

IIRC, they use some form of Solar/Celestial (??) navigation.