Migration flights - day or night?

To: "Birding-aus" <>
Subject: Migration flights - day or night?
From: "Robyn" <>
Date: Sun, 24 Sep 2006 15:39:19 +1000
When birds arrive at my place, it seems they are not there in the evening but 
are  there first thing in the morning, as though they always arrive during the 

This applies whether it is a long migration such as the  Koel, or something 
much shorter such as the Spangled Drongoes and Blackfaced Cuckoo-Shrikes which 
move down to the coast over winter.

If travelling over water, the flight must be constant for that period, but do 
birds mostly move at night where possible.   I've seen and heard ducks, etc., 
flying high at night, but wonder if this is a general rule, or does it vary 
from species to species?

I take it that the Koels travel across water then over land from Cape York 
down.   Would this be correct?


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