Episode: 6SummaryThis episode is Part 2 of 2 about Bird Songs. In the last episode, Part 1, we talked mostly about the \u201chow\u201d and the \u201cwho\u201d of bird songs. We haven\u2019t really talked about the \u201cwhy,\u201d the purpose of all these vocal sounds. This episode begins by looking at the functions of bird songs and calls.Then we get into variation in bird songs, at several levels, including among species and among geographic regions.You\u2019ll also learn about some interesting subtopics like the dawn chorus...