DUCKS, GEESE, AND SWANS. 235 
surround them—often taking advantage of a dense 
sea-fog to do so—and quietly drive them into a 
netted enclosure on the shore, where they are killed 
at leisure. One of these grand “drives” witnessed 
by Mr. Trevor-Battye resulted in the capture of 
upwards of three thousand Brents! A form or 
variety of the Brent Goose, with the under parts 
below the breast nearly white, is commonly found 
consorting with birds of the typical colour. It is 
the Bernicla glaucogaster of Brehm, and, as far as 
is known, breeds only in the Nearctic region. It 
is not known to differ in its habits from the more 
typical form. 
BERNACLE GOOSE. 
This somewhat larger species, the Axas leucopsis 
of Bechstein, and the Amser leucopsis of most 
modern naturalists, is a fairly common winter visitor 
to the British coasts, where it is most abundant on 
the western littoral, from Cornwall up to the 
Hebrides. Unlike the Brent, the Bernacle Goose 
frequently wanders inland to winter on large sheets 
of fresh-water. This Goose is readily distinguished 
by its white cheeks, and much lighter underparts 
below the breast. Owing to peculiarities of distri- 
bution, rather perhaps than to choice, the Bernacle 
Goose frequents more rocky coasts than its ally. It 
is also just as gregarious, but owing to the nature 
of its food is more of a land species, and certainly 
more nocturnal in its habits. Although frequenting 
sand-banks and mud-flats to sleep and to rest, it 
