I'd have thought most young birds would learn their calls in a pretty 
straightforward manner from their parents.  Certainly, young canaries 
don't learn to sing properly if not kept near an older male, and there 
are distinct call dialects among many species, etc.  However, unless 
this Kookaburra was orphaned, or its parents somehow fell down on their 
duties, then, all else being equal, you'd assume it would learn the 
proper call.  Maybe it just doesn't want to get onto the other part of 
its laugh, or maybe it does indeed need a speech therapist - maybe 
there is some physical defect which stops it giving its complete 
repertoire?  Just some of my thoughts, anyway.
John Tongue
Hobart.
On Wednesday, May 3, 2006, at 04:26  AM, Frank O'Connor wrote:
 
   I received the following query about a kookaburra learning to laugh.
    If anyone has any ideas, then please include Margaret in on the 
reply
   (email 
     From: "teddybearmargaret" <>
     To: <>
     Subject: A query about a kookaburra
     Date: Tue, 2 May 2006 17:21:20 +0800
     Hi Frank, I hope you may be able to help me with my query and if
     not maybe you can let me know how would be able to.
     We live on a farm 14 kilometres east of Geraldton.
     About October last year a nest couple of kookaburras had a baby 
and
     we were fascinated watching it learn to laugh, which it did in a
     couple of weeks.
     Then the parent birds had another young one just after Christmas.
     It is a male and he has never learned to laugh properly. We have
     been amused, annoyed and frustrated listening to him constantly
     trying to laugh. He gets to the kook kook kook kook section but 
can
     never get onto the the ka ka ka ka section of the laugh. We are
     wondering if this is common. Perhaps we need to get a kookaburra
     speech therapist for him.
     It would be interesting to know if this is common or unusual.
     Thank you for taking my email
     Margaet Adamson
     Moonyoonook
     Western Australia
   _________________________________________________________________
   Frank O'Connor           Birding WA [1]http://birdingwa.iinet.net.au
   Phone : (08) 9386 5694              Email : 
References
   1. http://birdingwa.iinet.net.au/
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