How to Identify the Sorong Green Tree Python (Identification Guide)

Key identifying features

The Sorong green tree python is a locality form of Morelia viridis collected from the area around Sorong on the Bird's Head (Vogelkop) Peninsula of West Papua, Indonesia. Like all green tree pythons, it is best recognized by its prehensile, laterally compressed body, a strongly prehensile tail, and its habit of resting in a distinctive coiled "saddle" position draped over a branch with its head resting in the center of the coils.

Coloration & pattern

Adults from the Sorong locality typically display a rich, uniform grass-green to emerald-green base color along the dorsal surface, often with scattered pale blue or white flecking distributed irregularly across the back, sometimes forming a broken vertebral line. The venter (belly) is pale yellow to white. Juveniles hatch in a strikingly different color phase — commonly a bright lemon-yellow or brick-red — and undergo an ontogenetic color change to green over the course of one to two years. This dramatic juvenile-to-adult shift is a defining trait of the species as a whole, and the specific balance of blue flecking versus solid green in adulthood is one of the traits breeders use to distinguish the Sorong locality from other Vogelkop-region populations.

Head, eyes & scales

The head is large, triangular, and distinct from the neck, with heat-sensing pits along the upper and lower labial scales that appear as small dark slits. The eyes are relatively large with vertically elliptical pupils, an adaptation for a primarily nocturnal, arboreal lifestyle. Scales are small and smooth, giving the skin a glossy appearance that helps set off the green coloration.

Size & body shape

Adults typically reach 4 to 6 feet in total length, with females generally growing larger and heavier-bodied than males. The body is noticeably compressed from side to side (laterally flattened), an adaptation that allows the snake to balance while coiled over a horizontal branch. This body shape, combined with a strongly prehensile tail, distinguishes green tree pythons from most other python species at a glance.

Range & habitat where you'll see it

This locality form originates from lowland and hill rainforest in the vicinity of Sorong, on the western tip of New Guinea. In the wild, individuals are almost always found in the mid- to upper-canopy of humid tropical forest, coiled on vines, saplings, or low branches rather than on the ground.

How to tell it apart from look-alikes

Separating the Sorong locality from other green tree python populations (such as Biak, Aru, or Jayapura) is difficult and relies on subtle differences in the density and color of dorsal flecking, overall hue of green, and blue tail proportions — traits that overlap considerably between localities and are best assessed by experienced keepers or breeders with confirmed lineage. Compared to unrelated species, the green tree python is easily distinguished from the emerald tree boa of South America by geography (New Guinea versus the Amazon), a different head scale arrangement, and different heat-pit placement.