おうみずなぎとりでしょう
大水薙鳥でしょう
ō mizunagitorideshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of おおみずなぎどり

1. Probably a frigatebird.

Polite
Presumptive
Conjecture
Usually Written in Kana