| Alone in a suburb of the same city, my husband away, one afternoon I mistook birdsong for a person whistling inside the house. |
| In a second, the air filled with birdsong, the number of birds doubling and redoubling, blocking out the sun. |
| One can listen to the rustle of woodland leaves or birdsong and view the scurrying wild animals or the graceful gliding swans. |
| Initially he proposed to explain birdsong as a display, enabling a discerning female to select a mate from among a number of males. |
| Listening to recorded birdsong is only one of many ways on the Internet to tune in to real animal voices. |
| No more beautiful birdsong, no more beautiful birds flying beautifully in the sky. |
