birding-aus

FW: [BIRDCHAT] Effects of Wind Turbines

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Subject: FW: [BIRDCHAT] Effects of Wind Turbines
From: (Andrew Taylor)
Date: Fri, 18 May 2007 11:51:32 +1000
On Fri, May 18, 2007 at 09:20:21AM +1000, Michael Tarburton wrote:
> Most swiftlets (including the White-rumped Swiftlet in Qld) echolocate as 
> does the Oil Bird of 
> Northern South America.

By coincidence a few hours ago I was at the "Cueva del Guacharo" where
Humboldt described the Oilbird behaviour 200 years ago and heard the
Oilbirds echo-locating.  At this cave echolocation lets them navigate
upto 400m inside.  They don't like narrow (less ~2m) opening susposedly
reflecting the limitations of their echolcation - the pulses are said to
be 3-6khhz.    They echo-locate on leaving but maybe not so much away
from the cave - like fruit bats, which don't echo-locate, they rely
heavily on smell to find fruit.

Andrew
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