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## What is Australia's Noisiest and Quietest Bird?

 To: What is Australia's Noisiest and Quietest Bird? Andrew Taylor <> 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 conditions 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. Andrew -------------------------------------------- Birding-Aus is now on the Web at www.birding-aus.org -------------------------------------------- To unsubscribe from this mailing list, send the message 'unsubscribe birding-aus' (no quotes, no Subject line) to m("vicnet.net.au","majordomo"); ```
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