こがしらねずみいるかでしょう
小頭鼠海豚でしょう
koga shiranezumi irukadeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of こがしらねずみいるか

1. Probably a small-headed dolphin.

Polite
Presumptive
Conjecture
Usually Written in Kana