-
higher northern hemisphere latitudes,
where their food
sources grow. They
irrupt out of the
breeding range when the cone crop fails.
Crossbills breed very...
- from
their summer range in winter. In poor
berry years huge
numbers can
irrupt well
beyond their normal range,
often in
flocks that on
occasion number...
- can
irrupt in non-predictable ways
depending upon the
complex feedback mechanisms caused by competition. A
species po****tion may
sometimes irrupt when...
- land. In
years when gr****hoppers and
other insects are abundant, it will
irrupt well
beyond its core range, with
significant numbers reaching France, the...
-
laying 3–5 eggs. This
crossbill is
mainly resident, but will
irregularly irrupt south if its food
source fails. The
American race
seems to
wander more frequently...
-
migrate ****her south. In some years,
large numbers of
Bohemian waxwings irrupt well
beyond their normal winter range in
search of the
fruit that makes...
-
substituting various objects for the
absolutely lost
primordial one, and
irrupting into
language without regard for the p****age of time, or for the particular...
- non-migratory and
usually stays within its
breeding range,
though it
sometimes irrupts southward. It is one of the few owls that is
neither nocturnal nor crepuscular...
- (86–104 °F). Po****tions of the pallid-winged gr****hopper
occasionally irrupt to
damaging numbers.
Between 1952 and 1980,
there were six
outbreaks in...
- can
wander almost anywhere close to the Arctic,
sometimes unpredictably irrupting to the
south in
large numbers.
Given the
difficulty of
surveying such...
