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

Noun
Desu Copula

The polite, past negative form of きあしせぐろかもめ

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

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana