幸福之歌我们知道,鸟儿的歌唱与疆界和孵化的权利有关。雄鸟为了吸引雌鸟和警告其他雄鸟离开而歌唱。这些歌包括威胁和恫吓,在更为复杂的歌里,也许还包括对合法行为的暗示。这是在严酷的世界中谋生的严酷的事情。每支歌都自有其微妙 The Song of Happiness We know that the singing of birds is related to the boundaries and hatchlings. The male singing in order to attract the female and warn the other male to leave. These songs include threats and intimidations, and in more complex songs, perhaps also imply legal cues. This is a harsh thing to make a living in a harsh world. Each song has its own subtle