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Channel-billed Cuckoo aggregations

To: Laurie Knight <>
Subject: Channel-billed Cuckoo aggregations
From: Tom Tarrant <>
Date: Mon, 11 Jan 2021 19:04:53 +1000
Probably a bit early in the season (usually March/April) but I suspect they congregate like this to 'teach' the young how to migrate north, as their host parents, Torresian Crows/Magpies/Currawongs are probably residents (certainly not long-distance migrants)
What do others think?
Tom

On Mon, 11 Jan 2021 at 18:30, Laurie Knight <> wrote:
G’day

My most common CBC observation is a single bird calling in flight, with numerous instances of coordinated duos. 

A while back I came across a group of 4 hanging out in a eucalypt and I was struck by their similarity with hornbills.

This morning I saw a combination of 7 CBCs (6 in a bunch an another flying to join them). My question, is why would such a large group come together?  I can understand a pair doing a nest raid, and two pairs facing off over territory, but why would 7 come together?

Regards, Laurie
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