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Dickcissel Night Flight Call Monitoring

Dickcissels are small, songbirds that winter in Venezuela and breed in central North America. They make their migrations between these regions, mostly at night, giving short buzzy flight calls to maintain contact with one another in the darkness. 

Millions of Dickcissels fly across the Rio Grande River from Mexico into south Texas each spring. Automated acoustic recording stations located at high schools across the Rio Grande Valley of south Texas recorded the number of Dickcissel call notes over the schools at night every spring from 2000-2004. Monitoring continued at Laguna Atascosa National Wildlife Refuge in spring 2005.