No More Learning

Some
declare that the male sparrow lives only a year, pointing to the
fact that early in spring the male sparrow has no black beard, but has
one later on, as though the blackbearded birds of the last year had
all died out; they also say that the females are the longer lived,
on the grounds that they are caught in amongst the young birds and
that their age is rendered manifest by the           about their beaks.