About the Green Tree Python Drawing
Since childhood, I have been fascinated by Green Tree Pythons (Morelia viridis) and Emerald Tree Boas (Corallus caninus). Although they belong to different snake lineages and evolved in the Australasian and South American tropics, respectively, both arrived at a remarkably similar solution to life in the forest canopy.
Adults of both species are usually green, with broad heads, slender necks, prehensile tails, and bodies adapted for moving and resting on branches. Both commonly drape themselves over a horizontal perch in a distinctive saddle-like posture, with loops hanging on either side and the head resting near the center. They are among my favorite examples of convergent evolution—different evolutionary histories producing strikingly similar forms in response to similar ecological challenges.
The snake portrayed in Aru Emerald was a captive-bred Green Tree Python descended from animals originating on Aru Island, Indonesia. The connection is especially appropriate because the Aru Islands are the locality from which the species was originally described in 1872.
I kept him in my office for several years. He was a beautiful and generally gentle snake, usually resting quietly in the characteristic branch-looping posture. I still had to be careful when reaching toward him, however. An approaching hand—especially a warm hand moving in dim light—could occasionally be interpreted not as the familiar hand of his keeper but as a mouse arriving within striking distance. That was not aggression so much as a highly developed feeding response doing exactly what evolution had shaped it to do.
Green Tree Pythons are ambush predators. Their prehensile tails and muscular bodies anchor them securely while they wait on branches or vines for prey to approach. When the opportunity arrives, the snake can launch the front of its body outward, seize the animal, and remain supported by the coils and tail wrapped around the perch.
Their mouths contain numerous long, sharply recurved teeth. These teeth help penetrate feathers and fur and prevent a bird, mammal, or other struggling animal from pulling free after an aerial strike. Once the teeth have secured the prey, the snake draws it back toward the branch and constricts it. The teeth are not venom-delivery structures, but a bite can nevertheless produce deep punctures—another reason I kept track of where my hands were when working around my office snake.
Small mammals and reptiles appear to form much of the diet, although birds are also taken. Younger snakes may use the tip of the tail as a lure, moving it like a worm to attract a curious lizard, frog, or other small animal close enough to strike.
The heat-sensitive labial pits along the lips add another dimension to this hunting system. These organs detect infrared radiation emitted by warm-bodied animals, providing thermal information that supplements vision and smell. Even in low light, the snake can detect the location of a mouse or bird and direct a strike toward the warmest parts of its body. From close range, the pits appear as deep openings set among the scales, giving the face an intricacy that is especially compelling in a detailed portrait.
Green Tree Pythons also undergo one of the most dramatic color transformations found among snakes. Young animals hatch either brilliant yellow or shades of red, orange, or maroon. As they grow, both forms eventually become predominantly green—sometimes passing through a remarkable patchwork of yellow, black, blue, and green during the transition.
The change is not merely decorative. Field research has shown that juvenile and adult coloration provides camouflage in the different environments used at different stages of life. Young snakes often occupy lower, more open vegetation and forest edges, where yellow or reddish coloration can blend with sunlit leaves, branches, and the varied colors near the forest floor. Larger green adults use more leafy vegetation, where green provides better concealment from both prey and visually hunting predators.
Researchers evaluated these colors through the visual systems of birds rather than simply through human eyes and found that each life stage was well matched to its typical surroundings. The transformation therefore accompanies a shift in body size, behavior, habitat use, and vulnerability. A yellow juvenile and a green adult may look like completely different snakes, yet each color is suited to a different chapter of the same life.
The change can occur surprisingly quickly, sometimes unfolding over only several days, and it is not simply produced during a single shedding of the skin. Pigments and light-reflecting structures within the skin change as the snake develops, gradually replacing the juvenile appearance with the emerald coloration of adulthood.
Their beauty has also made Green Tree Pythons highly desirable in the international pet trade. Although captive breeding is now well established, research in Indonesia documented thousands of wild-caught snakes being passed through breeding facilities and exported as supposedly captive-bred animals. Heavy collection depleted some island populations and caused many snakes to die during capture and transport. Knowing that the animal in my office was truly captive-bred was therefore significant; keeping and appreciating these snakes should not come at the expense of the wild populations that made them possible.
In Aru Emerald, I wanted to portray the adult result of that extraordinary transformation: vivid green scales, a golden eye, and the quiet alertness of an arboreal predator. The close composition and dark background concentrate attention on the eye, angular head, overlapping scales, heat-sensitive pits, and powerful mouth concealed beneath the lips.
The snake appears calm, but not inattentive. That expression reflects what I remember about having him nearby in my office—usually motionless and seemingly relaxed, yet continuously aware of movement, warmth, and opportunity in the space around him.
The title refers both to the brilliant emerald coloration of the adult and to the Aru Island ancestry of this particular snake. The portrait captures an animal that is visually beautiful but also remarkably specialized: shaped by life among branches, armed with long recurved teeth, capable of sensing invisible heat, and transformed during its lifetime from a brightly colored juvenile into a green predator of the canopy.
Aru Emerald is a colored-pencil wildlife drawing of a Green Tree Python (Morelia viridis) by Michael E. Dorcas for Tantilla Art.