Migratory Birds of the Great Lakes University of Wisconsin Sea Grant Institute
 about habitat birds + science 20 birds
aerialist raptors
copyright UW Sea Grant, writer: L. Wiland, design: T. Yao contact us credits

Great Blue Herons are usually quiet when away from their nests, though they will occasionally utter a deep, harsh croak during takeoff or when alarmed.

ML Reeb writer: Laurence Wiland design: T. Yao