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86 IGUANA  •  VOLUME 14, NUMBER 2  •  JUNE 2007 FLAGLE AND STOOPS

Villagers at the high-elevation sites where Boelen’s Pythons (Morelia boeleni) are found still use traditional methods to hunt.



Soaring mountains expand from the far east of Papua New
Guinea (PNG) to West Papua Indonesia (Irian Jaya). This

tropical island remains one of only a handful of the world’s pre-
served environments and undisturbed regions. Here, nestled
deep in the mountains of Papua Indonesia, hidden by the slow-
moving mist of the clouds, dwells a creature discovered only fifty
years ago and still living unchanged and unmolested by the out-
side world.

The habitat of Boelen’s Python (Morelia boeleni) is virtually
unknown. Access to the area is difficult and extremely danger-
ous due to the inhospitable topography, and locals are averse to
guiding outsiders into remote areas. Local inhabitants report
tales of cannibalism, and, in the past ten years, several newspa-
per accounts seem to provide evidence that such practices still
occur. So, traveling to the highlands of Papua Indonesia to
search for Morelia boeleni is not an adventure one chooses lightly,

Serpent in the Clouds:
Research and Conservation Efforts for the

Boelen’s Python (Morelia boeleni)
Ari R. Flagle and Erik Stoops

Center for Reptile and Amphibian Research
Phoenix, Arizona

Photographs by Al Baldogo and Ari R. Flagle.

IGUANA  •  VOLUME 14, NUMBER 2  •  JUNE 2007 87BOELEN’S PYTHON

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Due to the rugged topography, the highlands of West Papua Indonesia (Irian Jaya) are among the most remote and unexplored regions in the world.

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but after eight years of hands-on experience with this species, I
(Ari) was determined to take the risk.

In 1997, we developed the Center for Reptile and
Amphibian Research (CFRAR), which specializes in caring for
a diverse selection of exotic and difficult-to-maintain species.
Captivated as we were by the beauty and mystery of Morelia boe-
leni, it was at the top of our list. We began working with this
snake during the winter of 1998. In 2004, we wrote the first
comprehensive book (Black Python) dealing with the husbandry
of the species. During the winter of 2006, Eric proposed an idea
for a television series called “Reptile Chronicles,” which would
incorporate an animated reptilian host. As the subject for the
first segment, we selected the Boelen’s Python and shortly there-
after left for the uncharted mountains of Papua Indonesia.

From Ari’s travel journal:

There are many names for M. boeleni throughout Indonesia;
Wallow, Hitam Wallow, or Boelen. In Java, the indigenous people
call them “Sanca bulan.”

June 2: Feels like I have been here for months. Seven planes and three
days traveling. Armed soldiers all over. My bags were emptied of med-
ication, food, tools, batteries, and other small items that momentar-
ily appealed to the baggage handlers. The effort required to simply
make the trip is strenuous work for both the body and the mind. I
finally understand why most people do not come here: it is just too
difficult. The journey by truck is indescribable and I find myself mes-
merized by the culture and the physical environment. Never having
been in this part of the world, I am experiencing a sense of over-
whelming sadness for the people. The economy is such that they have
to work for little or nothing in order to survive. We really take for
granted what we have. I am feeling morose; I look into the distance
and see the mountains above and the clouds rolling over the jagged
faces of a virtually untouched environment that is calling to me. No
matter how tired I am. I cannot stop. This is why I am here.

June 3: The squatters (toilets) have buckets of dirty water and ladles.
You flush by pouring a ladleful of water into the hole. It’s taking me
a little bit to get used to, but at least it’s a toilet. The sewer system is
essentially a continuous ditch, five feet deep, that parallels the walk-
ing paths. It is filled with all the refuse and fecal matter in the vil-
lage. It was shocking to witness a local man miss the path and swerve
his bicycle into the squalid ditch. My instinct was to jump in after
him, but my guide grabbed my arm and wouldn’t allow it.

88 IGUANA  •  VOLUME 14, NUMBER 2  •  JUNE 2007 FLAGLE AND STOOPS

The unique natural habitat of Morelia boeleni creates several obstacles
when attempting to duplicate the environment in captivity.

Ari was quite a celebrity. Villagers hunted, slaughtered, and pit-roasted a wild pig in his honor.



IGUANA  •  VOLUME 14, NUMBER 2  •  JUNE 2007 89BOELEN’S PYTHON

June 4: We arrived in Irian or, as it is now called, West Papua,
Indonesia. As soon as we landed, our little plane was swarmed by
locals: people wanting handouts, selling trinkets, and trying to help
us carry our bags for money. I let a man carry my gear and he asked
me,“nama saya?” This means, “Is your name Mickey Mouse?” I
laughed and told him my name was Donald Duck and that I was
grateful for his help. Many people trying to be western-like — kind
of sad. The culture is so rich — why change it? After an uncomfort-
able night’s sleep, we were met by the truck that would transport us
to the mountains.

June 5: The mountains are amazing! We arrived at our base village.
The villagers hunted, slaughtered, and pit-roasted a wild pig in our
honor. I don’t eat pork but felt compelled to show my appreciation
for their hospitality. Then we geared up and set off into the moun-
tains — bad idea! This hike was like nothing I have ever done in
my life. We climbed a 70% grade of slippery rock and vegetation.
The path used by the indigenous people is very narrow. Then, to top
it off, I added 40–50 lb. with my backpack. I stepped off the path
and my foot fell through the ferns. Almost lost that one! As I antic-
ipated, the temperature range is from 90 °F in the lowland areas to
75–85 °F in the high country. Breathing is difficult due to the thin
air. There is also some talk about another tribe that continues to
practice cannibalism.

June 6: After the rigorous climb, we arrived at the next village in
late afternoon. Set up my tent at the edge of the village, then passed
out. I awoke shivering from the unexpected cold. Came out of my
tent, looked up, and was in awe. The mountains were dense with

vegetation and thick clouds were slowly moving over them. It was
truly breathtaking. We took temperature readings. They read 44 °F.

June 7–8: Scouting the mountains is extraordinarily exhausting.
There is not much visible reptilian life. I found a huge spider web
that spanned at least 12 x 12 ft., fishing-line thick.

June 9: One of the villagers handed us a bag. “Wallow, Wallow,” he
said. I looked in and sure enough... It was not just the snake, it was
the man and the expression on all our faces. I felt an overwhelming
shared connection with these people, their culture, their mountains,
their wildlife, and fauna. My research and work at the center had
not prepared me for this experience. Yet, theoretically, the writings of
Worrell and Brongersma provided me with a solid reference in
schematics for identification of the Boelen’s.

This snake (male) was first observed in Dimija on 25 December
1952 by a man named Dr. K.W.J. Boelen. On March 1955, the
second and third animals (females) were collected in Okito by
R. Den Haan. The fourth animal was collected by R. Den Haan
a substanial distance away at Wissel Lakes. The last animal
observed and collected was by a man named Dr. C.J. Royer on
19 February 1963 west of Lake Paniai. Prior to this discovery,
L.D. Brongersma (1953) described a new species of Serpentes,
Boidae (pythons were at that time considered to be in the same
family as boids). A portion of the description reads, “Rostral as
wide as high, visible from above, with a deep groove on each lat-Villagers were proud of their prowess with traditional weapons.

The mountains were dense with vegetation.



90 IGUANA  •  VOLUME 14, NUMBER 2  •  JUNE 2007 FLAGLE AND STOOPS

eral side. Internasals 1.2 times as long as wide. Anterior pre-
frontal only very slightly longer than broad (length 12.2 mm,
width 12.0 mm), 1.3 times as long as the internasals... A head
uniformly black above. Rostral black with the outer borders of
the labials yellow. The yellow stripes do not reach past the under
shield of the eye or nostril. The body is adorned with jet black
and yellow stripes covering the lateral side and dorsum of the
snake.” 

Information from this original description confirmed that
it was indeed the same species of snake, but classified by a dif-
ferent name. A specimen reported to have been collected from
the Lae territory of New Guinea was described by Eric Worrell
in 1958. The animal, named Laisis toronga was by description a
specimen of Liasis boeleni (the species since has been reassigned
to the genus Morelia). It was collected from within a chain of
mountains in the center of New Guinea. Both individuals
described the same scalation and coloration. L.D. Brongersma
noted “possible differences in color of the chin and throat of the
animals collected. This might be related to the sex of the animals
captured, males possessing more black marking under the dor-
sum of the chin and females showing more yellow. They have
been noted in the wild to reach lengths of 14 feet and the girth
of a grown man’s leg.”

In the early 1980s, when these pythons first appeared in the
United States, they originated from eastern Indonesia (PNG)
and differed in length and girth from animals imported more
recently. Stripes were white, and the animals were heavier and
more muscular. Today’s captive-hatched and farm-bred animals
in Indonesia are primarily adorned with yellow bands. They are
slim and fast.

The areas where the nest sites are located were extremely
dangerous and difficult to reach. The exterior nest areas were
covered with shed and scat. Steep slippery rocks and immense
amounts of vegetation were everywhere. All climbers had to step
carefully on a narrow path or risk falling 100 feet or more
through underlying ferns. In order to survive, an animal must
be able to navigate the deep, narrow rock crevices to reach shel-

In his original description of the species in 1953, L.D. Brongersma
noted “possible differences in color of the chin and throat of the ani-
mals collected. This might be related to the sex of the animals captured,
males possessing more black marking under the dorsum of the chin
and females showing more yellow. They have been noted in the wild
to reach lengths of 14 feet and the girth of a grown man’s leg.”

Brongersma noted a “head uniformly black above. Rostral black with
the outer borders of the labials yellow. The yellow stripes do not reach
past the under shield of the eye or nostril. The body is adorned with
jet black and yellow stripes covering the lateral side and dorsum of
the snake.”

Boelen’s Pythons live at high elevations in the remote mountains of
West Papua Indonesia (Irian Jaya). Although lowland temperatures are
around 90 °F, high country temperatures are 10–15 °F lower by day and
drop into the 40s at night. Breathing is difficult due to the thin air.
Locals mention another tribe that continues to practice cannibalism.



IGUANA  •  VOLUME 14, NUMBER 2  •  JUNE 2007 91BOELEN’S PYTHON

ter. In a captive setting, we know that these snakes are highly agi-
tated even after acclimation to new environments. We have
noticed that they are uncomfortable with large amounts of
space, but are equally anxious with too little room. After exper-
imenting, we found that an enclosure 6 x 3 x 3 ft. was most
acceptable. In captivity, snakes appear to prefer isolation except
during the breeding season from August to December.

The area inhabited by Boelen’s Pythons is high in elevation;
the clouds roll in during early morning and dissipate in late

afternoon. In our center, we create conditions in which we
incorporate low light with relatively high UV output. In the
mountain areas, basking sessions occur throughout the day
when the cloud cover breaks, allowing rocks to absorb heat. We
maintain basking lights for up to two hours at 90 °F, at which
time the automatic system shuts off, enabling the enclosures to
cool slightly (80–85 °F). We repeat the cycle at midday. Shortly
after the last basking session, a simulated mist provides a light
rainfall that generates the humidity calculated to reach between
40–60%. Care must be taken when utilizing misting units to
avoid excessive moisture. The enclosure must include at least one
dry area.

Considerable speculation has surrounded the issue of what
these snakes feed on in the wild; presumably their diet consists
of small birds, bats, and small mammals. While inland, we did
not see any ground-dwelling birds; however, our presence might
have been enough to scare them away. We did notice an abun-
dance of burrows. Most of these burrows appeared to belong to
bandicoots, small rabbit-like marsupials. In captivity, Boelen’s
Pythons are fed primarily rodents. Small, thawed chicks may
induce stubborn snakes to feed.

Several individuals active in the reptile trade in Indonesia
regularly produce Boelen’s Pythons. Why do the captive snakes
in Indonesia reproduce, but snakes imported from the same
country do not? One important consideration has to do with
natural factors that we can not replicate. Among theses are ele-
vation, climate, ultraviolet lighting, temperature, humidity,Clouds roll over the jagged faces of a virtually untouched environment.

The areas where snakes occur are extremely dangerous and difficult to reach. Steep slippery rocks and immense amounts of vegetation were every-
where. We climbed a 70% grade of slippery rock and vegetation.



moisture, soil, vegetation, and other wildlife. The uniquely
remote habitat of M. boeleni creates several obstacles when

attempting to duplicate the natural environment. Research with
captive-hatched offspring is necessary, because these animals are
more likely to adapt to an artificial environment.

Breeding this snake is not difficult, but the process of actu-
ally producing eggs in captivity is quite challenging. To our
knowledge, only two successful captive breeding records are
known — and these were never recreated. Animals that are
imported into the country are usually dehydrated, infested with
worms, and have suffered considerable stress from capture and
transport. Most animals perish within several months, and those
that survive have a relatively short life in captivity. When two sex-
ually mature animals (typically 2–3 years of age for females and
less for males) copulate, they subsequently display all of the dis-
tinctive signs of becoming gravid. Females will generally increase

92 IGUANA  •  VOLUME 14, NUMBER 2  •  JUNE 2007 FLAGLE AND STOOPS

Burrows were abundant and most appeared to belong to bandicoots,
small rabbit-like marsupials. In captivity, Boelen’s Pythons are fed pri-
marily rodents. Their natural prey is unknown.

To date, captive breeding of Boelen’s Pythons outside their native range has failed for reasons yet unknown, although captive-hatched or captive-
bred animals from Indonesia regularly enter the wild animal trade.



IGUANA  •  VOLUME 14, NUMBER 2  •  JUNE 2007 93BOELEN’S PYTHON

the period of basking and gradually refuse to feed. Females also
gain in size and girth and display classic pre-lay shedding behav-
ior. Unfortunately, in captivity, after shedding takes place, the ani-
mals fail to deposit any eggs. Why these animals fail to reproduce
in a captive setting is unknown. Of several hypotheses we have
considered, one suggests that the compatibility of the pair is
dependent on location. In the wild, biological markers such as
shed skin hanging from nearby bushes and trees and feces around
the nest site may allow snakes instinctively to recognize potential
mates. We also think that a specific set of pre-breeding behaviors
is necessary to stimulate proper egg development.

For the past seven years, the CFRAR has operated a privately
funded research project the primary goal of which is to shed light
on the unique behavior and captive propagation of Boelen’s
Pythons. “Project Black Python” emphasizes conservation efforts
for both captive and wild Boelen’s Pythons. We prohibit the use
of imported wild-caught adults as research subjects; only captive-
hatched or captive-bred animals from Indonesia are allowed to be
shipped. The Indonesian government pays close attention to the
high prices these animals fetch in private and black-market sec-
tors, and a yearly limit on sales is carefully controlled. Proof of a
legitimate sale and appropriate paperwork are required before any
of these rare snakes are permitted out of the country. 

We often wonder about the fate of these remarkable crea-
tures as more and more land is lost to deforestation. Is the only
means of successful propagation the creation of farms in the
species' natural habitat? Will some individual come one step
closer and produce viable eggs? When will we be able to raise
these animals to adulthood and develop a lineage of true cap-
tive-bred Black Pythons? Hundreds of species go extinct every
day. In the case of Boelen’s Pythons, we sometimes wonder if we
are meant to know more about them. Not long after they were
discovered, they vanished back to the clouds from which they
had emerged. Regardless, we intend to remain with them wher-
ever the journey leads…

Acknowledgements
Special thanks to friend Al Baldogo for an adventure of a lifetime
and JC2 Animated for taking on a great project.

The Indonesian government pays close attention to the high prices that
Boelen’s Pythons fetch in private and black-market sectors, and a yearly
limit on sales is carefully controlled. Proof of a legitimate sale and
appropriate paperwork are required before any of these rare snakes are
permitted out of the country.

In captivity, these snakes remain highly agitated even after acclimation
to new environments.

Captive-hatched and farm-bred animals in Indonesia are primarily
adorned with yellow bands. They are slim and fast.

The striking black and yellow pattern of Boelen’s Pythons helps to
break up their outline, making them more difficult to see for both
predators and prey.




