Seasonal patterns in owls' vocalisations

To: "birding aus" <>, "cog-l" <>
Subject: Seasonal patterns in owls' vocalisations
From: "Philip A. Veerman" <>
Date: Sun, 22 Apr 2001 14:45:54 +1000

Hi folks,

Can any of you please provide me with a specific reference citation that investigates or reports on whether our nocturnal birds, particularly the Southern Boobook, the Tawny Frogmouth and the Australian Owlet-nightjar, have seasonal changes in their calling behaviour (as in frequency of vocalisation of their most characteristic calls, not the type of sound made). Preferably based on south-east Australia. I don't doubt that they do but I want to do better than guess. It is for my report on the first 18 years of COG's GBS.

I don't wish to start a debate so please reply privately, thanks.


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