presumed Lapland Longspur nocturnal flight calls
Fig.4. Nebraska November 4, 1996 (WRE).
Fig.5. Nebraska April 16, 1997 (WRE).
Fig.6. Nebraska April 16, 1997 (WRE).
Fig.7. Nebraska November 4, 1996 (WRE).
Fig.8. Nebraska April 16, 1997 (WRE).
Fig.9. New York September 23, 1996 (WRE).
Hypothetical Lapland Longspur "hio" call given in night migration.