The sparrow outside the window is talkative on the telephone pole, which means that it is almost only in summer that the sparrow can be heard singing on the telephone pole, so it feels like summer. You mean that the woman says the sound made by the sparrow. saury is a kind of fish, and everyone knows that cats like to eat fish, but people also like to eat fish, so it is the taste of saury that cats and you want to know. The reason why saury is used is probably to rhyme.