DVD of the habits of a bird is very interesting. However, I become sleepy and cannot watch it till the last by all means when I watch it. Probably I think it to be because a song voice of a bird is comfortable. There is a bird floating using wind elegantly. There is a bird flapping the wings noisily. Though there were various methods, I thought so that it was all, and there was not waste. The DVD of the habits of a bird was very splendid. But I become sleepy.