My impression is that whilst numbers of most egret species at a site can
be from one to many, depending on the size of the habitat patch, I have
the impression that Cattle Egrets are rarely in singles, as in usually in
flocks, often large flocks. Then again, very likely a lot of that
impression derives from outside the COG area.
Philip
One answer to Geoffrey's question 'What is a lot?' comes from the ABR
data on Cattle Egrets in COG's area of interest:
- the 10 year average to 30 Jun 2013 was 7.2, and the 30 year average 6.9
- last year, ie the year to 30 Jun 2014, altho the mean number reported
was 13.8, the median was just 5.0, with the distribution being skewed by
multiple records of the large flock at Jerra in April 2014, max 101 on
16 April as Chris Davey mentioned.
Regards - David
*******************************************************************************************************
This is the email announcement and discussion list of the Canberra
Ornithologists Group.
Emails posted to the list that exceed 200 kB in size, including attachments,
will be rejected.
When subscribing or unsubscribing, please insert the word 'Subscribe' or
'Unsubscribe', as applicable, in the email's subject line.
List-Post: <>
List-Help: <>
List-Unsubscribe: <>
List-Subscribe: <>
List archive: <http://bioacoustics.cse.unsw.edu.au/archives/html/canberrabirds>
List manager: David McDonald, email <>
|