Balancing Kangaroo Island

To: Alan Leishman <>
Subject: Balancing Kangaroo Island
From: Lawrie Conole <>
Date: Thu, 31 Jan 2002 10:02:26 +1100
>HANZAB states the following " FOOD: Carnivorous; specialized 
in taking medium to large-sized arboreal mammals, mainly 
Common Ringtail Possums and Greater Gliders; also roosting 
birds and occasionally large beetles. Mammals take mostly in 
weight range of 50 - 100% of adult Owl body-weight (Kavavagh 

In my own experience here in southern Victoria, I know that 
Powerful Owls do prey extensively on birds at times - things 
like choughs, currawongs, kookaburras.  You'd need to have a 
firm contract in place with the owls that they should only 
eat Little Corellas and Galahs.  Almost inevitably the owls 
would start munching through the population of something much 
more sensitive than the various feral and out-of-balance pest 

The Common Brushtail Possum on Kangaroo Island is a large 
subspecies - the owls would have little impact on adults.  
There are rare examples of Powerful Owls taking young Koalas, 
but it's unlikely to be at population controlling levels!

Someone else already alluded to the scarcity of suitable 
breeding habitat for Powerful Owls on Kangaroo Island.  The 
vegetation is primarily mallee, with areas of Sugar Gum and 
Manna Gum in the north and west.  Any owls which did 
establish would be very localised, and would probably end up 
being nest competitors with the endangered Glossy Black-

Please - no more introductions to KI!!!


Lawrie Conole
2/37 Myrnong Crescent, Ascot Vale Vic 3032

AH 03 9370 3928  Mob 0419 588 993

Senior Zoologist
Ecology Australia Pty Ltd
88 B Station Street, Fairfield Vic 3078

BH 03 9489 4191  Fax 03 948 7679
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