| 31. | They released a new album of bird songs in 2014.
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| 32. | The area includes a natural fir forest where wild bird songs can be heard.
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| 33. | I never tire of bird song and sky and weather.
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| 34. | This is a potential example of the formation of a dialect in bird song.
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| 35. | Lahtveer said the nightingale was an early front-runner to take the Bird Song title.
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| 36. | The walls are plastered with maps of bird habitats and computer printouts of bird songs.
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| 37. | The air of Pine Canyon filled with bird song.
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| 38. | I'm acknowledged as an expert in bird song, and this one was very unusual ."
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| 39. | He transcribed bird song and wrote a book about musicology ( still used today ).
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| 40. | A person who is trained in bird songs can pretty much identify the different noises,
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