The anomalous song was sung repeatedly over a 45 minute period of observation (9.30-10.15 am, June, PA).
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-jxN1dR7d5rnRI31XaJQWcEifQHri3ZU7g5y2M-lRtTh4_hZoy9mD3J0BK5BEOmIL1W14LxnqKhQ-22G3kheQu0ryPcgRurwxVo_f0bCM_dAWr6W-eO25CsBzGXMzFjVi3ywj7_k5KdAc/s320/FIELD+SPARROW+var+song+PERT+PA+06172012.WAV.png)
At dawn the bird initially sang the anomalous day song, then a bouncing ball song a few times, then switched back to its day song (4.54am).
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhJQMJSKNRVFdP6Hwg9a7jqTlouJOZ9qghCXuYuKW6Pw6ZW642V7PDqE3yYxUWNNuXEbbLm8vnTUUyy8-YU-73a399UU35rABAep4S4u1TnqZiAB5t-tTO-hSppzDWxyvvnVHCA8QyPntZ/s320/FIELD+SPARROW+var+and+dawn+song+PERT+PA+4.54am++06192012.WAV.png)
Compare this sonagram with that of a typical day song below.
Typical bouncing ball day song (Mar, PA).
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhEu1GNLoX7BTW7996wE3lXPB9uVds5sg0-peGhGysTkC72XVF0lnabfOrDPKTlyLcrZuK3gg_kzr8_dalYF0Iz6eaLXZo_lm6dhPPoNi-G1sgeRCWyfcMa4v5r86xOpkklNTEMbUhTj6Fo/s320/FIELD+SPARROW+dawn+6.20am++PERT+PA+032312.WAV.png)
Example of a dawn song (May, DE)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjsb-YHj3KMELTe3tS8iy_z-Jk8iXyVe1CKjm_KH67dVpfw5dmqfwbT8kA65D_A46w01Uzq6yHutJlbytczl68oZO6Kfr9BWJLaEiDvu9NSPjJtXRtszqJUVV1I4ERiOAqFB1kMx9HNL9Q1/s320/FIELD+SPARROW+dawn+song+Prime+Hook+DE+5.33am++050111.WAV.png)
So this bird sang the usual bouncing ball day song only at dawn, and sang an anomalous song the rest of the day (confirmed by follow-up visits). The anomalous song actually has a close resemblance to one version of the dawn song (compare with the middle dawn example at The Music of Nature). This bird seems to have reversed its songs, singing a dawn song during the day and the day song only at dawn.
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