Printed on August 27, 2007
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Python VS Gator
Stephen Secor - Associate Professor, University of Alabama
Exploding python – Awakening gator
A 13-foot Burmese python, bloated and dead, was found in the Everglades National Park on September 26, 2005. There was a large gash in its side and from it protruded a 6-foot alligator. Helicopter Pilot Mike Barron and Wildlife Biologist Skip Snow discovered the creature within a creature. Photographs of the discovery flooded my email. I’ve been studying the digestive physiology of snakes for 15 years now, but I’d never seen a case like this one. It looked like the python had eaten the alligator, but then why was the python dead and half of the alligator exposed?
CSI: Everglades
Mike, Skip, and I returned to the crime scene with National Geographic’s Explorer to find out what happened. At 200 feet and at 50 mph, I was getting a bird’s-eye view of the new residency of the Burmese python within the Everglades, a landscape of tall grass, small tree islands, and the occasional “gator hole.”
We taped off the scene and brought out the photos Mike took the day of the initial discovery. With the laminated photos laid out on knee-deep water, Skip and I pieced together the possible series of events leading to the death of both animals.
Myths busted
There had been two theories – but both seemed unlikely. Gas (caused by the decomposing alligator) built up inside the python’s stomach causing the snake to combust. Or the python consumed the alligator while it was asleep, the alligator awoke inside the python’s stomach, and the alligator was clawing its way out of the python’s stomach when both expired.
Having worked on hundreds of Burmese pythons of all different sizes, I could not imagine that enough gas would have been produced by the decomposing alligator to cause a rupture in the very thick skin of the python. I have seen pythons after consuming very large meals expand to four times their diameter without any damage to their skin. From the photograph of the dead python, it appeared that the python may have only doubled in width due to the alligator meal. Also, like humans, pythons can pass excess gas from their stomachs.
As for the awaking alligator scenario, this would require that the alligator was not dead, but only unconscious when swallowed by the python. Pythons kill their prey by constriction and only eat once they have sensed that the prey is dead. On the chance that the alligator was not dead and regained consciousness inside the python’s stomach, it would have quickly succumbed to the lack of oxygen. In addition, with its hind limbs pinned tightly against its tail within the snake there would have been no room for the alligator to maneuver its feet and claw through the python.
There are two types of animals in the world: snakes and snake food
Can a Burmese python even constrict, swallow, and digest an alligator? While there are no published accounts of Burmese pythons in the wild eating crocodilians, we know that two other of the world’s giant snakes are able to so. There are accounts and photographs of anacondas in South America feeding upon caimans and a record of an African rock python constricting a Nile crocodile. Considering the list of formidable prey items that pythons are known to consume including leopards, wild pigs, impala, gazelles, porcupines, and pangolins, it is not unreasonable to suspect that they can also digest an alligator.
With the photographic evidence from the Everglades that the Burmese python can kill and swallow an alligator, members of my research laboratory and I set to see how well a python could swallow an alligator and how long it would take the snake to digest the alligator. From our colony of Burmese python we enticed an 800 gram snake to swallow a 200 gram alligator, already dead. To our surprise, the python easily swallowed the alligator, taking only about 15 minutes to do so.
Each day after the python had swallowed the alligator we transported the snake to a local veterinary clinic and X-rayed the snake’s midsection. The X-rays revealed clearly the daily disintegration of the alligator’s skeleton, first the skull, then the shoulder regions and forelimbs, followed by the pelvic region, hindlimbs, and tail, all completed within nine days. So, not only can a Burmese pythons swallow an alligator, it can also digest it.
There goes the neighborhood: What are pythons doing in the Everglades?
Why are there now Burmese pythons in the Everglades anyway and how will they impact the native animals? The first part of this question can be answered in two words, size and climate. Burmese pythons are one of the largest snakes in the world, able to exceed 20 feet in length. They were also the first python to become very popular in the pet trade due to their docile nature, ease of maintenance and breeding, and the development by snake hobbyists of several different color variants. Bred and sold by the thousands each year as hatchling for almost two decades, the young pythons with their voracious appetites simply grew too big for many homes.
Manageable at first in a 20 gallon aquarium on a diet of mice, a 4-year old Burmese python (12 feet in length), requires a very large cage and has graduated to a diet of rabbits. Unfortunately as these snakes grew too big, they were taken out to the countryside and released to fend for themselves. As a result, medium and large pythons have been discovered wandering the suburbs, woodlands, and countryside across the United States. With much of North American having a colder or a drier climate compared to the subtropical native home of the Burmese python, many of the released snakes were unable to survive through the year.
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One place that they are able to survive is southern Florida. With its general lack of freezing temperatures and high rainfall, southern Florida has become a new home to a plethora of introduced tropical species. From ponds and lakes hosting fish species from around the world, to large marine toads taking up residency in the backyards of Miami, to 6-foot Nile monitors roaming the neighborhoods of Cape Coral, the number of introduced exotic species establishing themselves in Florida is increasing yearly. Released from roadsides and parking sites in the Everglades, Burmese pythons have not only survived, they have grown, found each other, and reproduced.
As a new top predator in the Everglades, each of the python’s potential prey species is at risk. To date, Skip Snow has recorded from the stomachs and intestines of over 100 pythons captured in the Everglades the presence of at least six bird species, including grebes and ibises, a dozen different mammals, including raccoons and bobcats, and now added to the list, alligators. It may only be the larger alligators that are safe from the coils of the python.
Is there hope to control or eradicate pythons from the Everglades? It is going to be a very tough battle for two reasons. First, the Everglades Park is vast, much of it is remote, and there are large tracts of dense vegetation. The efforts of Skip Snow and his colleagues to capture and remove pythons may only be effective near roads and areas of easy access. For much of the Everglades, pythons are going to be free from any human contact. Second, pythons are now more popular as pets than ever. Each year, tens of thousands of pythons are imported into the U.S. or bred for the hobbyist.
Whereas the popularity of the Burmese python has wavered recently, large numbers of ball, blood, and reticulated pythons are being sold. While ball and blood pythons only reach 6 feet in length and are less apt to out grow their homes and thus be released, the reticulated python is the longest snake in the world. There are as many pet reticulated pythons being sold today as there were pet Burmese pythons being sold15 years ago. If history repeats itself, reticulated pythons could become another addition to the top end of the Everglades’ food chain.
So what really happened?
We honestly don’t know what happened in September of 2005. From our investigative photos, we concurred that the python had eaten the alligator. Within a couple of days of doing so the python, dead or alive, had been attacked by another animal—most likely a much larger alligator. Also, the python had been dead for at least one day before being discovered. What we were not able to decipher was exactly how long the alligator had been in the python’s stomach, if another predator had killed the snake, or if it had died prior to that encounter because it was unable to digest the alligator.
What we do have are the photos taken after the fact, the observations of Mike Barron and Skip Snow, and the knowledge of scientists. Like in any crime story, there is crucial information withheld from the public.
In this case, the withheld information includes (1) that when the alligator was pulled out from inside the snake, its skull showed signs of being digested, (2) the python’s skull was crushed and in fact was denuded of soft tissue due to the scavenging by small fish and crayfish, (3) there were several fresh bite wounds on the python, and (4) the python has sustained a large wound days, even weeks, before consuming the alligator.
So, here is one possible scenario. Sometime in August or September the python receives a large wound from another predator, possible another alligator, at a site about a third of the way back on the snake’s body from its head. While the edge of the wound was healing, the inner region of the wound, due to the lack of adequate blood supply, became necrotic as the tissue died. The wound though was not severe enough to prevent the python from killing and swallowing the 6 ft alligator. A day or so later, another alligator encounters and attacks the python. This alligator bites the python at several sites, including where the old wound was festering and produces a large opening in the side of the python. In the struggle, the alligator bites and crushes the python’s head and in pulling on the python’s head the hindlimbs and tail of the swallowed alligator become exposed through the large open wound. The alligator then leaves the dead snake (possibly to return later) and after a day or two of bloating and decomposing, the snake and alligator are spotted by Mike Barron while flying overhead.
While this is a hypothetical chain of events, there are still several questions we haven’t been able to answer. First, if a large alligator did kill the python, then why did it not eat it? Besides the crushed head and the large open wound, the only other wound was about two-thirds back on the body, with the rest of the snake intact. Was the alligator waiting for the snake to become more tender from decomposition before feasting, a behavior practiced by their crocodile cousins? Second, why wasn’t the python picked cleaned by scavengers? Patrolling the skies of the Everglades are vultures and ravens ready to make short work of any dead, decaying animal. It is hard to imagine that they missed seeing and smelling a dead 13-ft snake and a dead 6-ft alligator. Maybe they did, or maybe they were chased off by the large alligator protecting its meal.
We will never know exactly what happened in September of 2005 in the struggle between python and alligator; it will always remain a mystery. What we can imagine is that this struggle will be played out again and again in the Everglades each time the paths of these two predators cross.
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1 Comment
Why can I not see the pictures on the Taboo - Python vs Alligator ?
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