くろとうぞくかもめでしょう
黒盗賊鴎でしょう
kurotōzokukamomedeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of くろとうぞくかもめ

1. Probably a black thief gull.

Polite
Presumptive
Conjecture
Usually Written in Kana