The reticulated python is the longest snake on Earth, but it is not the heaviest.

Nature · Published 3 October 2026 Swipe more like this →

In short: Reaching lengths of up to 10 meters, the reticulated python dominates the record books for sheer reach. Yet, despite its massive size and reputation as a lethal constrictor, this Southeast Asian giant is surprisingly adaptable, thriving in everything from dense tropical forests to the sewers of modern, bustling urban centers.

The reticulated python, scientifically known as Malayopython reticulatus, holds the title of the world's longest snake. While historical records suggest individuals can reach 10 meters in length, most specimens are significantly smaller, typically measuring under 5 meters. Its status as the longest snake is occasionally challenged by the green anaconda, which is heavier, though the python remains the only extant species that regularly exceeds 6 meters. In 2014, genetic evidence led to the reclassification of the species into the genus Malayopython, distinguishing it from the broader Python genus.

These snakes are masters of stealth, utilizing heat-sensing pits along their lips to detect prey in the dark. They are non-venomous constrictors that kill by suffocation, a process that usually takes three to four minutes. Their diet is remarkably broad, ranging from bats and birds to large mammals like pigs and deer. In urbanized areas, they have been known to consume household pets, and in rare, documented instances, they have attacked and killed humans. Despite these encounters, the International Union for Conservation of Nature classifies them as a species of least concern due to their ability to rapidly reproduce and adapt to human-altered environments.

Reproduction in this species is complex. Females are polyandrous, mating with multiple males, and can even store sperm for delayed fertilization. In rare cases, they can reproduce asexually through parthenogenesis. A female typically lays 20 to 50 eggs, though clutches exceeding 100 have been recorded. She provides a unique form of maternal care by coiling around the eggs and shivering to generate heat, maintaining the necessary temperature for incubation. Once the hatchlings emerge after nearly three months, they are entirely independent, reaching sexual maturity between the ages of 3 and 5, with a lifespan that can extend to 32 years in captivity.

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