だいこくむくどりぎであれば
大黒椋鳥擬であれば
daikokumukudorigideareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of おおくろむくどりもどき

1. If it were the great black-billed gull…; If one were a great black-billed gull…

Ba Conditional
Usually Written in Kana