Figure 3. Eastern Bluebird vocalizations.
A. Loud Song (Borror Laboratory of Bioacoustics no. 17107; recorded in Franklin Co., OH, 3 Mar 1989). B. Predator (Alarm) Song (Library of Natural Sounds, Cornell University, no. 44105; recorded by Randolf Scott Little at Hilton Head I., SC, 18 Mar 1979). C. Tu-a-wees of adult males given at nesting box (from Sylvia Halkin and PAG, Oglethorpe Co., GA, 26 Jun and 6 Jul 1993). D. Tu-a-wees of adult females given at nesting box (from Sylvia Halkin and PAG, Oglethorpe Co., GA 9 and 18 Jul 1993). Sonograms prepared by staff of Borror Laboratory of Bioacoustics, Ohio State University, using a Kay Elemetrics DSP 5500 Sona-Graph (with an effective frequency resolution of 600 Hz and a 100 pt. transform size).