What is Australia's Noisiest and Quietest Bird?

Subject: What is Australia's Noisiest and Quietest Bird?
From: Andrew Taylor <>
Date: Tue, 9 Nov 2004 10:45:56 +1100
Noisiest could mean a few things including:

a) the calls which reaches the highest power 
b) the calls which contain the most energy
c) the calls most easily detected by a human in certain ambient conditions
d) the calls most easily detected by a conspecific in certain ambient
e) calls which propagate furthest in a certain environment

and it matters which you are talking about.

Uperoleia lithomoda is a small (~25mm long) Top End frog. Its call is
a click like two pebbles colliding.  The (short-term) power reached by
its call is the highest of the (few) measurements I've seen for frogs.
My back-of-the-envelope maths suggests its 10x that of a crowing rooster.
Its possible for a tiny animal to produce this power because does it
only for a very short time - 0.02 second, hence the (total) energy in
its call is much more modest.

Someone suggested Sulphur-crested Cockatoo as the noisiest bird.
Its broadband chaotic calls must contain a lot of energy but they won't
be as easily detected at distance as narrow-band calls such as whistles.

Small choruses of frogs can be heard by humans at over 1km so I'd bet
some bird can be heard at that those distances too.  A Powerful Owl call
must be audible at considerable distance in quiet conditions.

Birding-Aus is now on the Web at
To unsubscribe from this mailing list, send the message 'unsubscribe
birding-aus' (no quotes, no Subject line)

<Prev in Thread] Current Thread [Next in Thread>

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the birding-aus mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU