きそくはいくろかもめじゃなかった
黄足背黒鴎じゃなかった
kisokuhaikurokamomejanakatta

Noun
Da Copula

The past negative form of きあしせぐろかもめ

1. Wasn't a yellow-footed, black gull.

Past/Perfective
Negative
Usually Written in Kana