Article: Flight speed of Ross's gull Rhodostethia rosea and Sabine's gull Larus sabini.

(Received 8 August 1997; accepted in revised form 19 January 1998)1 Department of Animal Ecology, Lund University, Ecology Building, S-223 62 Lund, Sweden; anders.hedenstrom@zooekol.lu.seABSTRACT. I report here for the first time measured flight speeds of Ross's and Sabine's gulls, obtained by optical range finder on the northeast Taymyr peninsula, Siberia. For two flocks of Ross's gulls, airspeeds were 12.2 m/s and 14.6 m/s. Mean airspeed for the Sabine's gulls was 13.9 m/s (SD = 3.4 m/s, N = 6). A comparison of these measured airspeeds with characteristic speeds predicted from aerodynamic theory showed that the Sabine's gulls were flying significantly faster than ...

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