There are a number of geese species that are found in Portugal.
These include the bean goose, the pink-footed goose, the
white-fronted goose, the greylag goose, the snow goose, as well as
the Brent goose.
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The name 'Brent' comes from the naming policy of Shell UK
Exploration and Production, operating on behalf of Exxon and Shell,
which originally named all of its fields after birds (in this case
theBrent Goose).