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 G'day G 
  
I find that the Mangrove Gerygone has a much more
uniform face than the Brown Gerygone which has quite a mottled whitish look
about it. 
  
I gather that you're familiar with the call of
the Brown Gerygone - funny little mixture of squeeky notes. The best way to
locate the Mangrove Gerygone is often by its call which compares fairly well
to that of the White-throated Gerygone, though not as complex. It's a very
musical series of descending notes sometimes referred to as the "falling leaf"
call. You're almost certain to hear this charming chappie before you see 
it. 
  
Hope that helps. 
  
Happy Birding 
Ricki Coughlan 
Belrose, Sydney 
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