Brant (goose) the "Agreement on the Conservation of African-Eurasian Migratory Waterbirds" applies. "Branta" is a Latinised form of Old Norse "brandgás", "burnt (black) goose", and "bernicla" is the medieval Latin name for the barnacle. The brant and the similar barnacle goose were previously considered one species, formerly believed to be the same creature as the crustacean. That myth can be dated back to at least the 12th century. Gerald of Wales claimed to have seen these birds hanging down from pieces of timber, William Turner accepted the theory, and John Gerard claimed to have seen the birds emerging from their shells. The
Red-breasted goose Red-breasted goose The red-breasted goose ("Branta ruficollis") is a brightly marked species of goose in the genus "Branta" from Eurasia. It is sometimes separated in "Rufibrenta" but appears close enough to the brant goose ("Branta bernicla") to make this unnecessary, despite its distinct appearance. It is currently classified as vulnerable by the IUCN. "Branta" is a Latinised form of Old Norse "Brandgás", "burnt (black) goose and "ruficollis" is from the Latin "rufus" "red" and "collis" "necked". All the species of the genus "Branta" are distinguished by their dark sooty colour, relieved by white, and as a distinction from the grey