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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