文档介绍：智课网TOEFL备考资料
托福阅读机经背景材料
摘要： 托福阅读机经背景材料，为了帮助同学们更好的学****托福写作，小马过河为同学们搜集了托福阅读机经背景材料，希望能够帮助到同学们。
小马 老师将重点放到一些相似的英语背景材料分析上，下面就和小马一起仔细来看看是通过怎样的实验来了解鸟类学****唱歌这个过程的。
BACKGROUND/DISCUSSION
Songbirds include those birds from the order Passeriformes, commonly called passerines. There are approximately 5,400 different species of passerines. The suborder Oscine includes those birds that we tend to think of as your typical songbird, those birds that have complex songs as adults. In the majority of Oscines, the male is the one with the complex singing ability, and there is much diversity among males of different species in the length and complexity of their songs.
Song needs to be developed, just like any other characteristic of songbird behavior. Singing the correct song for that species is not an instinctual process. The need to sing is instinctual, however what song to sing has been found to be learned. When and where young songbirds learn their songs has long been studied. Just as songbirds differ in their songs, they also differ in their song learning process, though some basic principles seem to be the same. Many species learn their song only during the first few months, though a few can learn songs their entire lives. Also differing between species is from who the songs are learned, and how much of