canberrabirds

1 down, 45 (thousand) Mynas to go

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Subject: 1 down, 45 (thousand) Mynas to go
From: "Geoffrey Dabb" <>
Date: Tue, 12 Apr 2005 08:33:48 +1000
In the rather unlikely event that each of the 2 hawks took a myna each day plus an additional myna every second day that would account for 1095 mynas in a full year, or a myna exhaustion period of 41 years, given a finite allocation of (the premised 45,000) mynas.  However I think you would need to allow for the possibility that the myna population would be reproducing itself over that period while the hawk effort would be more or less constant and possibly even decreasing as myna availability declined (getting the very last myna might be a challenge), unless of course the (initial) abundance of mynas led to smaller territories and also more hawks over the period, which raises the question why that has not happened already, or has it .....?  I wonder if the Kambah sparrowhawk/myna ratio does not reflect a classical balance, gains in efficiency in capture and evasiveness keeping pace with one another. 
 
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