Quote:

Start of a conjecture:

see para 2

Like some insects, some birds use polarized light to assist in navigation. Insects tend to be less active at midday, because there is less polarized light when the sun is high.



Yes, inselpeter, but you and your url don't address my question, namely, is it your observation that non-migrating gatherings of birds fly east in the morning and west in the afternoon?

The question is simple...address it.