I am curious. Why would there be any negative interaction suggested, between
the Koels and the Channel-billed Cuckoos? They are very different, mainly in
size and parasitise very different hosts. Perhaps as adults they eat similar
food. Do they have a reason to dislike each other? Has Penny observed
aggression? Koels are very noisy regardless, and could easily be described
as "complaining" at anything. Even among the normal and similar looking and
same sized smaller cuckoos, I don't think they interact much (I have never
seen it). In Brain's comment below, maybe the word "displacing" is not the
right word but that was about Currawongs which are a host species.
Philip
-----Original Message-----From: Birding-Aus
On Behalf Of Stephen Ambrose
Sent: Wednesday, 27 December, 2017 7:51 AM To: 'Penny Brockman';
Subject: Re: [Birding-Aus] Cuckoos
We've had both Koel and Channel-billed chicks raised in our garden or our
neighbour's garden in Ryde, NSW in the 14 years that we've been here. My
impression is that both species can raise young in the same neighbourhood
each year, but not necessarily every year. For instance, the Channel-billed
Cuckoo seems to be successful in parasitising a nest in our garden or
neighbour's garden once every 3 years on average. I suppose it comes down
to the availability of nest hosts - if the cuckoos have successfully
parasitised nests one year, then they may need to move to other locations
the following year or two years to allow their local host population to
build up again.
Kind regards,
Stephen
Stephen Ambrose
Ryde NSW
-----Original Message-----From: Birding-Aus
On Behalf Of Penny Brockman
Sent: Tuesday, December 26, 2017 10:12 PM To:
Subject: Re: [Birding-Aus] Cuckoos
I don't think the Channel-bills have replaced the Koels, just given the
latter something to complain about, which they were doing loudly over the
weekend in Normanhurst as the Channel-bills cackled early morning.
On 23/12/2017 12:45 PM, Brian Fleming wrote:
> Some years ago the ABC did a short report on Channel-billed cuckoos
> spreading into Sydney and displacing the unwanted Currawongs.
>
> Brian Fleming (who HEARD a Koel in an adjoining suburban garden in
> Ivanhoe some years ago).
>
>
> On 23/12/2017 6:08 AM, Geoff Ryan wrote:
>> I know why Judith. All the Koels are here at Yamba NSW but no
>> Channel-billed cuckoos.
>> Geoff
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