ML237419591

媒体文件注释

2 males birds chasing each other and counter-singing with second-category song. Birds almost entirely singing second-category songs, one briefly gave a string of first-category songs for about a minute that I did not capture, but was able to capture one bout of first-category song. First cut of chases between the two birds, including a string of chip notes from both and occasional flight calls. Next cut at 48s of birds counter-singing close with second-category songs. Third cut at1:09, more spread out counter-singing between the birds Final cut at 2:11, one bout of first-category song

额外物种

• Field Sparrow Spizella pusilla
• Song Sparrow Melospiza melodia
• Pine Warbler Setophaga pinus
• Indigo Bunting Passerina cyanea
• American Goldfinch Spinus tristis
• American Crow Corvus brachyrhynchos