Казарка американська

Водиться на Алясці, зимує в Баха-Каліфорнії.

На сьогоднішній день в місцях його проживання налічується близько 114 000 птахів і приблизно 14 000 щорічно відстрілюються мисливцями. Популяція на 1981 рік була 200 000 птахів, а на 1987 рік у два рази менше.

• Millington, Richard (1997) Separation of Black Brant, Dark-bellied Brent Goose and Pale-bellied Brent Goose Birding World 10 (1) :11-15; an identification paper
• Syroechkovski, E. E., C. Zöckler and E.Lappo (1998) Status of Brent Goose in northwest Yakutia British Birds 93 (2) :94-97; this paper presented claims that Black Brant and Dark- bellied Brent Goose were interbreeding extensively in the Russian Arctic
• Sangster, George (2000) Taxonomic status of bernicla and nigricans Brent Goose British Birds 91 (12) :565-572; a critical re-evaluation of the claims made in the above paper by Syroechkovski et al.
• Bloomfield, Andrew and James McCallum (2001) Changing fortunes of the Black Brant Birding World 14 (2) :66-68; discusses the history of Black Brants in Europe, and the history of hybridisation between Black Brant and Dark -bellied Brent Goose
• Martin, John (2002) From the Rarities Committee's files: Unusual Brent Geese in Norfolk and Hampshire British Birds 95 (3) :129-136; this article discusses two Brent Geese, seen in Норфолк and Гемпшир in 1998/99, which showed some but not all characters of Black Brant; photographs of both accompany the article
• Wynn, Russell (2002) Brants — the hybrid problem Birdwatch 118:16-18; an examination of possible hybrid Black Brant × Dark-bellied Brent Goose, based on wintering birds in Hampshire
• Black Brant Geese, an indicator of wildlife sustainability in the Georgia Basin Environment Canada. Retrieved October 10, 2006