Was Vasuki a fast hunter?

The snake's vertebral structure suggests that speed was not its primary weapon. A body that broad and that heavy would have moved slowly, the researchers argued, favoring ambush over pursuit.

The pattern resembles the hunting style of modern anacondas and large pythons, which lie in wait and overpower prey through constriction (a killing method that tightens the body's coils until the victim's circulation fails). Vasuki likely behaved similarly, remaining motionless in marshy habitat until prey approached within striking distance. The ancient environment around the Kutch fossil site contained wetlands and swamps consistent with this hunting mode.

Why did some prehistoric snakes grow so large?

During the Middle Eocene (a geological epoch spanning roughly 56 to 34 million years ago), the climate of the Indian subcontinent ran substantially warmer than today, with average temperatures near 28 degrees Celsius. Snakes are ectothermic, meaning they depend on external heat to regulate body temperature, growth, and digestion. Warmer conditions can support larger body sizes in such animals.

Yet temperature alone does not explain gigantism. Food supply, habitat, and evolutionary ancestry all contribute. Vasuki belonged to Madtsoiidae, an extinct family of snakes that persisted for roughly 100 million years, from the Late Cretaceous to the Late Pleistocene, and ranged across India, Africa, Europe, South America, and Australia.

Datta and Bajpai found that its closest relatives were Madtsoia pisdurensis, also from ancient India, and Gigantophis garstini, known from North Africa. The branching pattern (the way evolutionary relationships split across the family tree) suggests that a lineage of giant madtsoiids originated on the Indian subcontinent and dispersed into Africa and southern Eurasia after India collided with Asia around 50 million years ago.

What else lived alongside Vasuki?

A 2025 study by Datta and Bajpai in the Journal of Paleontology added important context. Additional fossil snakes from the same Eocene deposits in western India revealed a diverse community, including the aquatic species Pterosphenus rannensis and another large madtsoiid that shared the marshy habitat with Vasuki.

The evidence suggests that Vasuki was not an isolated oddity but one element of a richer snake ecosystem occupying tidal flats, swamps, and inland marshes across a coastal plain that no longer exists.

A separate 2025 study in the Journal of Vertebrate Paleontology examined fossil anacondas from Venezuela and concluded that those snakes had already reached around 5.2 meters by roughly 12.4 million years ago. Ancient anacondas, in other words, were giants long before the climate of South America matched the Eocene warmth that accompanied Vasuki.

The full picture of Vasuki indicus remains incomplete. Its precise size, diet, and behavior are inferences drawn from a partial backbone. What the fossils establish is that, roughly 47 million years ago, a slow, heavy, marsh-dwelling serpent large enough to rival Titanoboa ruled a tropical coast on a young Indian landmass.