Warbling vireo (Vireo gilvus). 

The plain vireo with a happy, jumbled song. 

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The following Cornell Lab | Macaulay Library recordings were used in this episode: 

• Warbling vireo song by Geoffrey A. Keller (ML507826) 
• Warbling vireo call by Randolph Little (ML507833) 
• Warbling vireo second call by Geoffrey A. Keller (ML507828) 
• Purple finch song by Gregory Budney (ML510176) 

Sources and more: 

• https://www.allaboutbirds.org/guide/Warbling_Vireo 
• https://www.audubon.org/field-guide/bird/warbling-vireo 
• Dobson, C., Kassenbaum, D., Oehmke, D., & Misewicz, M. (2023). Field guide to hotspots and birds in Illinois. Scissortail LLC. 
• Godfrey, M. A., & Kaufman, Kenn. (Directors). (2004). National Audubon Society videoguide to the birds of North America [Video recording]. In Audubon videoguide to 505 birds of North America DVD I & DVD II (Fullscreen.). Godfrey-Stadin Productions. 
• Peterson, R. T., & Peterson, V. M. (1980). A field guide to the birds: A completely new guide to all the birds of eastern and central North America (Fourth edition, completely revised and enlarged.). Houghton Mifflin Company. 
• Sibley, D. (2016). Sibley birds East: Field guide to birds of eastern North America (2nd ed.). Alfred A. Knopf. 
• Walton, R. K., & Lawson, R. W. (1989). Birding by Ear: Eastern/Central [Compact Disc]. On Eastern/Central birding by ear. Houghton Mifflin Co.