Frigate Birds

Black Frigate birds,
with their long scimitar wings and
forked
tails, hang like sinister kites, in the
wind,
all along the Costa Rican coast.
They hold a single
position in the sky, as if suspended,
from invisible strings, and from this
airborne perch,
chase
after
gulls and terns, until they release their
catch,
(birders have a name for such thievery: klepto parasitism).

Despite the sinister look, imparted by its long
hooked
beak,
the frigate bird is quite beautiful.
The adult male
is all black
with a lustrous faint,
purplish green sheen
on its back, (especially during the
courtship season).

The female, the much larger
of the two, is easily
distinguished
by the white feathers, that
extend up her
abdomen and the breast, and the ring
of bluish mascara,
she wears around her eyes.

Second, only to a frigate bird's concern for food,
is
its
interest
in the opposite sex. It is the females, who do
the conspicuous searching out and selecting of mates.
The hens take to the air, above
the rookery, to look
over
the males, who cluster in groups, atop the scrubby
mangrove bushes. Whenever a female, circles low over
the bushes,
the males react, with a blatant display of
wooing.

They tilt
their heads
far back, to show off their
fully
inflated scarlet
gular pouches, (appropriately shaped
like
hearts!), they vibrate
their wings rapidly back and
forth,
and entice the females with
loud clicking and
drumming
sounds.

To walk through a colony, of
Frigate Birds courting,
is a spellbinding experience. The lusty atmosphere
is
palpable. You
may even see pairs entwined, the male
with his wings, around
his mate.

Once the pair is established, a honeymoon of nest
building begins. In the structured world of the
Frigate
birds, it is
the male's job, to find twigs for the nest.
The piratical
frigates, will not hesitate to steal
twigs from
their neighbors'
nests, so the females stay home to
guard it.

A single egg is laid, and each parent
takes turns, at
one
week shifts, during the eight week incubation. The
chick
is
closely guarded, for predatory neighbors, hawks
and
owls,
make quick feasts, of the
unwary young.


For five months, the dejected looking
youngsters, sit
immobile, beneath the hot sun, even when
finally airborne,
they remain dependent on
their parents, for over a year,
while
they learn
the complex trade of air
piracy.

Superb stunt flyers,
Frigate birds often bully other
birds,
on the wing, pulling at the
tails of their victims,
until they
release or regurgitate, a freshly caught
meal.
Frigate birds, also catch much of
their food themselves.
You may see them skimming the water, snapping up squid,
flying fish, and other morsels, off the water
surface.

They must keep
themselves dry, as they have only
a
small preen gland, insufficient to oil
their feathers. If
they get too wet, they become waterlogged and
drown.
Frigate Birds are easily seen close-up,
en masse
along the mangrove-lined shorelines of Guanacaste,
and the Gulf of Nicoya, sunning themselves, often in a
near vertical position, with wings turned "palm up."





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