| 11. | The desert here is silent, but for bird song and wind.
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| 12. | In 1959, Swedish painter and film producer Friedrich J�rgenson was recording bird songs.
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| 13. | You appreciate bird song more as you get older, says Williams.
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| 14. | I was locked outside, listening to bird song and looking at trampled thistle.
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| 15. | Crozier conducted a study on the acoustic adaptation of bird songs.
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| 16. | The new research, which includes the controversial stem-cell approach, began with bird songs.
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| 17. | Recordings of bird songs have also been used in numerous works.
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| 18. | He was also the first to use musical annotation to describe bird song.
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| 19. | Recommended sounds include bird song, insect chirps, sea waves, and similar.
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| 20. | On one recent afternoon, the quiet is punctuated with bird song.
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