How the Anhinga Eats
anhinga n.
Any of a genus (Anhinga) of long-necked birds having a
sharp, pointed bill and inhabiting swampy regions of
tropical and subtropical America. Also called darter,
snakebird, water turkey.
-- American Heritage Dictionary
Audubon Park in New Orleans is a sprawling stretch of
greenery with a number of long ponds filled with waterfowl.
I sometimes fly to New Orleans to visit my sister Sally, and
she and I go over to the park and walk and do some bird
watching. We do more interesting things in New Orleans, of
course. The bird watching isn't spectacular, but if you are
from Arizona, there are at least three birds that you are
not going to see at home but are sure to see there. They are
the white ibis, the little blue heron, and the anhinga.
When I was there last time, the white ibis just sat and
looked at me and the little blue heron did nothing more than
walk around gingerly in the shallow water. I took a couple
of snap shots. I was happy enough to see these birds but
they did not provide me with as much to think about as the
anhinga did.
Anhingas are large rather sloppily feathered birds who can
often be seen perched upon posts or docks with their wings
spread out in the sun. Anhingas, you see, have no oil glands
to waterproof their feathers. They must frequently dry
themselves in the sun or else they'd get waterlogged and
sink to the bottom of the pond and drown. Well, I guess that
they would anyway. The birds eat fish and the way they catch
them impressed me when I last went to New Orleans.
The anhinga floats like an armful of wet laundry, its wings
spread and its wide, multi-feathered archaeopteryx tail
soggily half floating, half sinking behind it. Its head is
submerged well below its body as the bird hunts in the
underwater foliage.
The anhinga stiffens when it spears a fish, and then
surfaces upright with that fish impaled and held high upon
its dagger-like bill. The fish, often a tiny immature
bluegill, quivers in agony and the anhinga faces a sudden
difficulty -- an entanglement of kinds: the bird's bill is
stuck, and stiffly so, through the body of the fish and is
therefore securely fastened shut. The bill cannot open to
swallow the fish -- not with the fish itself impaled upon
it. So the anhinga must take action to remove the fish
and retrieve and eat it. Here's what it does:
The anhinga lowers the fish and then whips its head upward
-- a expertly executed movement -- to fling and dislodge the
bluegill from its bill. The bluegill flies upward --
directly upward, and then when the fish descends, the
anhinga catches it in its mouth -- well, much of the time.
Even the anhinga does not have perfect technique, and the
fish sometimes falls slightly right or left or fore or aft
of the bird's waiting bill so that it cannot be caught and
devoured in a single toss. In such cases, the anhinga's
deftly practiced bill bats the fish back in the air for
another try -- and then another -- and another if need be,
and the fish is repeatedly sent skyward until it sails
directly toward zenith and then descends neatly into the
open mouth of the anhinga. No seal in any circus ever
balanced a ball on its nose with greater dexterity than the
anhinga juggles a bluegill.
The anhinga has a reason to be good at juggling. If the fish
fell back in the water, the anhinga would have but poor
means to retrieve it. The bird, as its common name "water
turkey" implies, is about as streamlined as a wet mop head
and could scarcely pursue and respear the fish. No, the
bluegill would dart, though mortally wounded, into the lake
weed and die, and the bird would go hungry.
Still, the anhinga's strategy is an excellent one. If
you have ever put on a mask and snorkel and lazily drifted
beneath the surface of a shallow lake or pond into the
weeds, you know that there are always plentiful fish there
and somewhat curious and trusting fish at that. Gigging them
with as nicely designed a spear as the anhinga's long neck
and sharp bill would be a simple thing and if you were the
bird, only a few minutes of work a day would provide you
with more food than you could possibly digest -- this
providing, of course, that you didn't wake up one morning
with, say, a stiff neck.
Creatures in the wild must be pretty healthy to survive --
and ones with specialized strategies for procuring
nourishment must be especially healthy because if any part
of their system breaks down -- in this case, the sharp bill,
the quick neck, the careful balancing act, etc. -- the
animal cannot feed. Compare a kingfisher, which must hover
and dive headfirst into the water to catch a fish, to a
surface feeding duck. A bad head cold would put the
kingfisher out of commission long enough to starve him while
in the meantime the surface feeding duck might miserably
dabble its way to good health and happier times. That's my
theory anyway.
I'd rather be the kingfisher, or the anhinga because if
you're healthy you're eating a lot better than any
mallard that is sucking up scum and trying to filter it out
for its edible content.
All of this brings us to part of the reason for one's
watching birds. It is the vicarious pleasure one derives
from watching whatever the animals do -- and while the
vicarious pleasure for some might be watching them fly or do
a hundred other things, what more vicarious a pleasure is
there than one that deals with food? This is the reason I
prefer diving ducks to the dabblers. The divers eat
mollusks, and the dabblers -- well, who can say? I like
sardines and smoked oysters and so naturally my sympathetic
nature reaches out more to diving ducks and American
Oystercatchers, who do what their name implies, and even
with birds such as dowitchers and snipes who probe for worms
with their long bills -- even though I don't eat very many
worms.
But I digress. My contention at the end of all this is that
since there is not room for such information in common bird
guides, a special edition should be produced that shows in
detail what each bird eats and how he goes about it. It'd
sell big -- especially if it were set up like a regular
familiar field guide and included other fascinating facts
about each bird. The traditional field guide concentrates
mainly on identification. There may be descriptions or even
illustratons of behavior or habitat, but these are
principally to aid the bird watcher in determining what bird
has been seen. The guide I propose would simply add to
everyone's knowledge of each species and increase bird
appreciation.
Therefore, instead of the typical citation in the guide:
ANHINGA
Common in fresh-water swamps, ponds, and lakes, where it
spears fish. Often swims with only head and neck exposed.
Long straight bill, long tail and white wing and back plumes
differentiate it from cormorants. Usually seen singly, but
may soar very high in flocks.
I propose:
ANHINGA
Also called darter, snakebird, water turkey. Life
span: 3 to 5 years. Mates for life and male takes turn
incubating eggs in the floating nest. Spears fish in shallow
water and does an amazing juggling act when it flips them
from its bill into the air to be caught and swallowed. Eats
from 12 to twenty bluegills a day and supplements its diet
with lake weed. Anhingas are unsafe to handle as their sharp
bill can poke out an eye. Resembles an armload of laundry
floating in the water. Produces no water repellent oil and
will sink to the bottom of the lake and drown if its
feathers are not dried frequently. Not generally considered
edible, but poor people on the Bayou report that it tastes a
great deal like chicken.*
*Many of these facts are for the purpose of argument only
and are not scientifically accurate.