41.   The walls are plastered with maps of bird habitats and computer printouts of bird songs.

42.   They imitated bird songs to draw the hunters deeper into the field.

43.   Water and wilderness cocoon the island, creating a silence that makes visitors notice the music of wind, waves and bird songs.

44.   With no audience but one another, they did an impromptu oldies-but-goodies concert, their voices sweet as bird song.

45.   You appreciate bird song more as you get older, says Williams.

46.   Bird songs mingle with the chant of Buddhist monks in village temples.

47.   In the pauses between, bird song twitters from the thick greenery along the road.

48.   Mennill proved the chickadee cheating by recording some of the bird songs and then engaging in a singing contest with a male bird.