Reticulated pythons are the longest snakes on Earth. In 2017, in Sulawesi, Indonesia, a 7-meter reticulated python was found dead with a large bulge in its midsection. When villagers cut the reticulated python open, they found the body of a 25-year-old man named Akbar Salubiro, who had gone missing the previous evening. The reticulated python had swallowed him whole. The case of this reticulated python was widely misreported at the time- real and documented, but also genuinely rare.
The case was real and documented. It was also genuinely rare. Malayopython reticulatus, the reticulated python, is the longest snake on Earth, with verified lengths exceeding 6.5 meters and unverified reports of individual reticulated pythons approaching 8 meters. A reticulated python is physically capable of consuming a human adult. Reticulated pythons do so almost never, not because a reticulated python lacks the capacity but because humans are not part of the reticulated python’s prey base and encounters that result in predation are the exception rather than the rule across millions of human–reticulated python interactions annually across Southeast Asia.
What the reticulated python actually eats, and how a reticulated python manages the physiological demands of consuming prey that can equal or exceed its own body weight, is a more interesting story than the rare exceptions when a reticulated python encounters a human.
Reticulated Pythons: The Swallowing Mechanism
A reticulated pythons has no venom. A reticulated python kills by constriction, wrapping its body around prey and tightening with each exhale until the prey’s cardiovascular system fails. The process for a reticulated python is faster than it appears. Death in large prey animals occurs within minutes, primarily from cardiac arrest rather than suffocation, as the pressure the reticulated python exerts prevents the heart from filling between beats.
The jaw of a reticulated pythons is not hinged in the way popular accounts suggest. The lower jaw of a reticulated python is not dislocated during swallowing. Instead, the two halves of the lower jaw of a reticulated python are connected by an elastic ligament that allows them to spread independently, and the quadrate bone creates a stretchable connection between the lower jaw and the skull. The skin of the throat and body wall of a reticulated python is highly elastic. The combined effect allows a reticulated python to swallow prey with a diameter several times larger than its own head. Researcher Scott Boback at Dickinson College has studied constriction mechanics in pythons and boas in detail, using pressure sensors implanted in prey animals to measure the forces involved. His work has shown that constricting snakes, including the reticulated pythons, apply pressures sufficient to stop cardiac function within seconds of initiating a full constriction, far faster than the suffocation timeline that older accounts described.
The Metabolic Shutdown
After consuming a large meal, a reticulated python enters a physiological state that has no equivalent in mammals. The digestive organs of a reticulated python, which have been largely shut down between meals to conserve energy, rapidly upregulate. The intestine of a reticulated python doubles in mass within 24 hours of feeding. The liver, kidneys, heart, and stomach all increase in size and metabolic activity as the reticulated python mobilizes resources to digest a meal that may take weeks to fully process.
Stephen Secor at the University of Alabama has studied python digestive physiology extensively, and his work has documented metabolic rate increases of up to 44 times resting levels during peak digestion in Burmese pythons, a closely related species. The heart of a reticulated python actually grows during digestion, increasing in mass by approximately 40% within 48 hours of a large meal, then returning to its resting size as the reticulated python completes digestion.
Range and the Invasive Problem
This extreme metabolic flexibility allows a reticulated python to survive extended fasting periods between meals. A large reticulated python can go without food for over a year while maintaining body condition, drawing on fat reserves and reducing its metabolic rate to a minimum. For a reticulated python, the feast-and-fast cycle is not a limitation of the snake’s biology. For the reticulated python, the feast-and-fast cycle is the strategy.
Reticulated Pythons is native to South and Southeast Asia, from Bangladesh through the Indonesian archipelago to the Philippines. The reticulated python is the apex predator in many of the ecosystems it inhabits, with adult reticulated pythons consuming deer, pigs, primates, and large birds.
A related species, the Burmese python Python bivittatus, has established a breeding population in the Florida Everglades following releases and escapes from the pet trade beginning in the 1980s. The Everglades population, now estimated at over 100,000 individuals, has caused catastrophic declines in native mammal populations. Researcher Michael Dorcas at Davidson College documented declines of over 90% in raccoon, opossum, and bobcat populations in areas of high Burmese python density in the decade following python establishment. The marsh rabbit has effectively disappeared from much of its former Everglades range, illustrating how a large constrictor comparable in size to a reticulated python can transform an ecosystem.
The reticulated pythons is not established in Florida, but the Burmese python invasion illustrates what happens when a large constrictor without natural predators enters a naive ecosystem. The prey animals of the Everglades did not evolve alongside large constrictors and have no behavioral responses to them. A raccoon that has never encountered a large python or a reticulated python does not recognize such a predator as a threat until it is already being constricted.
The snake that swallowed a man in Sulawesi is the same species, the reticulated python, that has been kept as a pet, farmed for its skin, and hunted for meat across Southeast Asia for centuries. The fear a reticulated python generates is real but statistically misplaced. The ecological damage a related species is doing in Florida, quietly and largely out of sight in the sawgrass, is not.