Biol. Bull.
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Biol Bull 139: 495-501. (December 1970)
© 1970 Marine Biological Laboratory
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SENSITIVITY OF ECHOLOCATION IN CAVE SWIFTLETS

DONALD R. GRIFFIN 1 and RODERICK A. SUTHERS 2

1 The Rockefeller University and New York Zoological Society, New York, New York 10021
2 Indiana University, Bloomington, Indiana 47401

The acuity of echolocation in Collocalia vanikorensis granti was studied by measuring the success of freshly captured birds in avoiding cylindrical obstacles in total darkness. The percentage of misses varied from approximately 40% with 2 millimeter insulated wires to 80% with 6.3 millimeter iron rods and 68% with 8 millimeter plastic tubing. The orientation sounds used for echolocation are clicks with the major energy between 4.5 and 7.5 kHz. Although the frequency range of hearing in these birds has not yet been measured, it seems probable that they can echolocate obstacles as small as 6 millimeter diameter rods by means of frequencies within the range of human hearing.




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M Konishi and E. Knudsen
The oilbird: hearing and echolocation
Science, April 27, 1979; 204(4391): 425 - 427.
[Abstract] [PDF]


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