Sounds I Hear 2-２ [revised]

(I want it to be like a casual novel. Like Amy Tan.)
Several seconds passed before they flew away saying kakakakakaka.... They might have been in deep thought. The name of the birds turned out to be 'mourning dove'. It was a very unexpected name to me because they sing with soft voices but in a humorous manner. They say hoot, hoot, hoot, like owls, but in a higher tone, then once in the phrase it becomes about one octave higher and they say like 'He'. I don't know what they were mourning about, but they have not visited me for quite some time.

数秒あって、彼らはカカカカカカ…と言って飛び立った。考え事でもしていたのかもしれない。その鳥はナゲキバトというのだと分かった。私はその鳴き声は和やかだけれどすっとんきょうだと思っていたから、意外な名前だった。ホウ、ホウ、ホウ、と、フクロウの声をもっと高くしたような柔らかい声だが、何度目かは、ㇶー、と、１オクターブくらい高くなる。何を嘆いていたのか知らないけれど、来なくなってもうずいぶん長くなる。