Most
people have seen programs on television showing crocodiles attacking large
animals like deer and cattle. While this is amazing, and sometimes horrifying,
those creatures
are not alligators. The function of a crocodile's
dentition is somewhat different than an alligator's. Alligators favor prey
items that will fit inside their head. That is, if they can
swallow it
whole, then they will normally attack it. While I've heard witnesses tell
of alligators taking deer in the park, the prey was very small fawns. Alligators
have also been
seen with large nutria. But, most of the time, they will
eat things like small fish, frogs, and crayfish. Snakes and turtles are
also pursued, with alligators seeming to be especially
well-adapted for
eating turtles. A recent study done in Texas examined the stomach contents
of about 50 alligators (which were unharmed). Research showed that only
one of
these alligators had eaten a bird (which couldn't be identified,
it might have already been carrion when taken), and the rest had stomach
full of small fish and shellfish. I've seen
11-foot alligators going
after prey that was no larger than their largest teeth (very small frogs
and fish).
6/24/2007--(added 12/11/2016) I
was walking along the Spillway Trail when I noticed an alligator
chewing on something. Since I couldn't see any fur, and the carcass had
legs, I
assumed that the alligator was eating the carcass of a smaller
alligator. On further examination through binoculars, I discovered
that the carcass was actually that of a very large
softshell turtle.
The alligator had somehow eaten out the center of the turtle's
caracass. This left a "ring" of shell and flesh, and this ring was
wrapped around the alligator's lower
jaw. When the alligator tried to
swallow the carcass, only part of it could go in. I watched the
alligator struggle with the carcass until I had to leave to work elsewhere in the park.
----
WELL,
IT SOUNDED
TASTY
A LITTLE
CLOSER
EVEN
CLOSER
I'M TIRED OF CHEWING
THIS
----
FIRST
TRY
DIDN'T GO DOWN
THIS TIME IT WILL
GO
A TOSS
BACK
The
series starting with the 4th picture from the left above (TIRED OF CHEWING)
shows the final disposition of this non-food item. This was a small alligator,
about 4 feet long.
I wonder if this plastic bottle will have an adverse
affect on the alligator's alimentary canal. I also wonder if something
like this has been the cause of death for the dead alligators
what turn
up occasionally.
------
GULP!
AND NOW IT
GOES.....
...DOWN...
...THE HATCH.
The
image below is an animated gif of the final image sequence I show above.
I built it to repeat only 5 times, so if you don't see movement, refresh
the page.
-----------------------------------------------------
I really
didn't expect the alligator to continue chewing on this inert object, and
I was totally surprised that the alligator ate it. Last April (4/09/06),
I heard a loud crunching sound
near one of the fishing piers on Elm Lake.
When I investigated, I found an alligator with a plastic bottle, as shown
below (see DO GATORS DRINK). As shown in this movie
clip
1.9MB ,
that alligator
let go of the bottle after just a few chews. I expected this one to do
the same.
January
01 and 08, 2006--
The winter has been quite mild here. At Brazos Bend State Park (BBSP),
we still haven't gotten enough rain to bring up the water levels in the
lakes to their
usual height. The mild weather has favored the alligators.
Not only that, but the alligators have been fairly active! The alligator
feeding on the nutria (described a few weeks ago) is just
one example of
various feeding events that have been witnessed throughout the park this
winter. On two Sundays in a row, I was able to see alligators eating turtles.
First, on January 1,
I saw an alligator in 40-Acre lake eating a small
red-eared slider. The first picture below (SMALL TURTLE CHOMP) shows one
of the alligator's early attempts to crush the turtle.
The alligator is
about 8 feet long, and the turtle is about 4 inches long. The video clip
is linked below the picture.
-------
RICKUBISCAM SHOT
SMALL TURTLE CHOMP ----
REALLY BAD
DAY
THE TURTLE, CIRCLED
FULL CHEWING
CLIP( WMV) 1371kb GULPING
DOWN THE TURTLE WMV 4902kb - GULPING
SLOW MOTION WMV 2527kb
As I
was watching, the alligator tossed the turtle a bit to reposition it. The
turtle was then held at the end of the alligator's jaws. As I prepared
to film the next movement, the alligator
tossed the turtle into the back
of its throat, and swallowed it. Today's RICKUBISCAM shot (above left)
is a frame from a video clip showing the small red-eared slider's last
view of the
world. The image shows the slider peering out as the alligator
is swallowing it. This happens happens very quickly in the clip and was
only visible to me when I was reviewing the film frame
-by-frame. Two more
view can be seen above (GOODBYE EVERYONE and CIRCLED), and there are links
to two video clips. The clips are interesting because there is apparent
movement
in the bottom jaw--like manipulation of a tongue--visible. It's
also apparent how the alligator uses gravity to help force food down its
throat. The slow motion clip also, of course, allows a
glimpse of the turtle
as it is swallowed.
On January
8, I was watching some alligators near piers 4 and 5 on Elm Lake. While
I was watching and filming two alligators, another one off to my left suddenly
burst into motion. Of
course, I was filming the wrong alligators. I moved
a few steps closer, and set up the camera. I knew that if the alligator
had seized something that it would move to the nearest bank to eat
it.
I was correct, and the alligator went to the island and started tossing
something. Through binoculars I could see that it was a large turtle (this
was a large alligator...at least 10 feet long).
The island is a bit
far for my still camera to capture effectively, but I got a chance to try
the zoom on my video camera. The images below are frames from the video.
The video works
better than the stills, unfortunately, but the images give
an idea of what the clips show. This alligator took about 15 minutes to
catch and swallow the turtle. Alligators, although powerful,
seem to tire
quickly, and will often rest for 5 to 30 minutes between short bouts (about
1-2 minutes each) of prey squeezing or shaking.
-----
POSITIONED
CORRECTLY
CRUNCH!
FURTHER
REDUCING
IT'S GONE
TOSS
AND CRUNCH WMV 6332kb CRUNCH-SLOW
MO WMV 4066kb REDUCING
WMV 2722kb
SWALLOW WMV 2215kb
The first
two images (POSITIONED CORRECTLY and CRUNCH!) are from the first video
clip (links are under the pictures). There are a few interesting points
about the clip (as well as
the slow-motion version). First, is the volume
of the sound of the turtle shell. As I stated before, I was on the Elm
Lake trail, and the alligator was on the bank of one of the islands. I
was
not straight across from the alligator, so I could film from the side.
I was, I estimate, about 50 yards away. The day was windy. Yet, the video
camera still picked up the sound of the shell
crunching.
Second
is the power shown as the alligator bit cleanly though, breaking the turtle
in half. It's possible to see the bunching of the huge jaw muscles as the
alligator bites down.
The
third image (FURTHER REDUCING), is from the next clip, which shows the
alligator further preparing to finish its meal. Note the arched tail. I
find this interesting because it is
probably just a side effect of the
effort of raising the head so far. I know that the tail arch is a social
signal, and I wonder if this position says anything to other alligators.
Would the tail
arch alone convey any kind of message ("keep back", for
instance), or does the entire body position lend context to this? ("keep
back", but maybe "this alligator is feeding"--which is
unintentional because
the tail arch isn't done "on purpose"?) Also, he takes a slight rest after
manipulating his prey with the head raised out of the water; even though
it seems that the prey
is positioned for swallowing.
The
fourth image (DOWN IT GOES) is from the last clip. This shows the prey
being swallowed and the high head lift necessary. The gravity feed is evident
again. Once the prey gets to a
certain point, the alligator seems to have
to work it down by tilting its head. When I give an alligator program,
sometimes I like to let the participants lift a part of large alligator
skull.
A large alligator skull is solid--for crushing strength--and
pretty heavy. It takes an effort to lift a 15-inch long skull and swing
it quickly from side to side. It isn't easy to hold it tilted
with the
snout up, or work the jaws, either. While I am not built to manipulate
an alligator skull, that doesn't lessen the fact that this is a massive
object that the alligator is moving around
--sometimes with amazing speed.
This is NOT counting the additional load caused by prey held in the jaws.
Bearing that in mind, it isn't surprising the the alligator requires many
rest periods
while manipulating or swallowing prey. The respiratory/circulatory
system that the alligator is also not conducive to long periods of sustained
activity.
I'm
so pleased to be able to observe these magnificent animals!
If you'd like to know more about the park follow these links:
Brazos Bend State Park The main page.
Brazos Bend State Park Volunteer's Page The volunteer's main page.
And, this page shows alligators at the park, on land, near various landmarks at the park.Go back to my main alligator page, Alligators
Go back to my home page, Welcome
to rickubis.com
Go to the main alligator page