It is such little discoveries that I find so enjoyable. I'll bet you can't find that kind of information in an illustrated book. What I know comes just from my experience walking around mountains and fields. It just happens that such knowledge has now become useful in my life. My strong point is that I have good ears.
Birds really emit many different sounds.
Mr. Urano can imitate many different types of bird calls. By the way, I've also heard that you're very good at imitating birds' singing. I would say more than 30. I create the sounds using my teeth and tongue, and by breathing in and out. For some sounds, I need to make funny faces, so it can be embarrassing.