コクガンじ字FuriganaMeanings1nounbrent goose; brant gooseusually written using kana aloneRefers specifically to the species Branta bernicla, a small dark goose. Usually written in katakana as コクガン.コクガンは冬ふゆに日本にほんへ渡わたってくる。Brent geese migrate to Japan in winter.