Woma and Black-Headed Pythons

The genus Aspidites is endemic to Australia and represents the earliest-diverging lineage of all living pythons. Both species are entirely terrestrial and fossorial, spending the day sheltering in self-excavated burrows or those of other animals, and emerging at night to hunt. Both share the defining characteristic of the genus: the complete absence of heat-sensing labial pits found in all other python genera worldwide. This absence is believed to reflect their high dietary reliance on reptile prey, for which infrared heat detection offers little advantage. Both species possess some degree of thermal sensitivity in specialised rostral scales at the tip of the snout.

Woma Python (A. ramsayi): Native to the arid and semi-arid interior of Australia — spanning western and central Western Australia, the southern Northern Territory, northern South Australia, southwestern Queensland, and the far northwest of New South Wales. It inhabits sandy deserts, spinifex grasslands, mulga and acacia scrublands, and clay-soil woodlands. Wild populations in southwestern Australia have declined dramatically since the 1960s due to habitat clearing and introduced predators; the southwest Wheatbelt population is considered locally extinct. The Woma is listed as vulnerable or endangered in some jurisdictions. Woma Python: Adults typically 1.2-1.7m.

Black-headed Python (A. melanocephalus): Native to the tropical and subtropical northern third of Australia, broadly distributed from the Kimberley across the Northern Territory and into Queensland. It inhabits dry sclerophyll woodland, tropical savanna, rocky escarpments, monsoon forest edges and farmland — notably more habitat-generalist than the arid-specialist Woma. The Black-headed Python is also immune to the venom of other Australian snakes, an extraordinary adaptation allowing it to actively prey on brown snakes, tiger snakes and death adders. Adults typically 1.5-2.0m; some individuals reach 2.5 m and beyond.

Both species are terrestrial and fossorial — floor area is far more important than enclosure height. Enclosures should prioritise length and width. Hatchlings of both species can be started in small secure tubs (10-15 L) and upgraded progressively as they grow.

Woma Python: Minimum 120 x 60 x 45 cm for adults; 150 x 60 x 45 cm or larger for individuals over 1.5 m. Substrate depth minimum 10-15 cm.

Black-headed Python: Minimum 180 x 60 x 60 cm for adults; 200 x 60 x 60 cm or larger for individuals approaching or exceeding 2 m. Substrate depth minimum 15-20 cm. The enclosure must be very robustly constructed with a secure fastening mechanism — Black-headed Pythons are powerful and will exploit any weakness.

Deep, loose, compactable substrate is essential for both species. Suitable options include a sandy loam or red desert sand mix, aspen shavings, or a blend of coconut coir and sand. The substrate must allow the snake to construct stable burrows. Paper towels or newspaper can be used for hatchlings. Avoid fine, dry sand alone as it compacts poorly.

Thermal gradient: Woma Python — hot spot 33-35°C; cool end ambient 26-28°C; night minimum 20-22°C. Black-headed Python — hot spot 34-36°C; cool end ambient 24-26°C; night minimum 20-22°C. As terrestrial snakes that thermoregulate from warm ground surfaces, both species benefit most from under-tank heating (heat mat or heat cord) as the primary heat source. A secondary overhead ceramic heat emitter can supplement ambient warmth, particularly for Black-headed Pythons. All heat sources must be controlled by a quality thermostat. Do not use hot rocks. Verify temperatures daily with a temperature gun or calibrated digital probes.

Provide snug enclosed hides at both warm and cool ends. For Black-headed Pythons, provide a water bowl large enough for the snake to fully soak in. Lighting on a 12-hour cycle is appropriate; neither species requires UV lighting. Keep enclosures away from direct sunlight and loud disturbances.

Both Aspidites species are carnivores that in the wild consume a high proportion of reptiles — lizards, skinks, geckos, dragons and (in the case of the Black-headed Python, which is venom-immune) other snakes including venomous species — as well as small mammals, ground-nesting birds and eggs. In captivity, pre-killed or thawed frozen rodents are the appropriate dietary staple. Mice suit juveniles of both species; rats are appropriate for adults. Live prey should not be offered — it poses unnecessary welfare and injury risk.

Prey size should approximate the widest girth of the snake's body — a slight lump after feeding is normal. Prey that is consistently too large risks regurgitation and digestive stress. Feed adult animals every 10-14 days; Woma juveniles and subadults every 5-7 days; Black-headed Python juveniles every 7-10 days. Adults of both species are often better served by smaller, more frequent meals than a single very large prey item. Monitor body condition carefully — obesity is a real risk in both species if feeding intervals are too short or prey is consistently oversized.

Both Aspidites species are typically enthusiastic, sometimes aggressive feeders and must be fed using tongs of adequate length rather than by hand. Woma Pythons in particular are noted for their vigorous feeding response and have been documented swallowing feeding implements presented alongside prey — always remove tongs immediately after the snake strikes. Some Black-headed Pythons may initially resist rodent prey if previously fed on reptile items; scenting the rodent with lizard shed or skin briefly can encourage acceptance.

Always allow a minimum of 48-72 hours after feeding before handling. Fresh dechlorinated water must be available daily. Womas rarely soak; Black-headed Pythons will sometimes immerse in their water bowl — provide a heavy bowl large enough for the snake to enter and that cannot be tipped.

Hatchlings and juveniles of both species benefit from being left largely undisturbed in the first weeks after acquisition — resist the urge to handle frequently until the animal is feeding voluntarily and consistently. Once feeding is established, begin brief, calm handling sessions and build duration gradually.

Both species are generally manageable once settled, though juveniles of both can be defensive and quick to strike. Adult Woma Pythons typically become calm, curious and tolerant of consistent handling — they are active and alert snakes with a strong feeding response. Adult Black-headed Pythons can also become manageable, but retain a degree of independence and their powerful build demands ongoing respect; an adult can apply considerable constriction force when threatened. Female Black-headed Pythons become notably more aggressive during egg incubation and should be handled minimally during this period.

Always use a hook or stick tap on the snake's body before lifting — this signals a handling interaction rather than a feeding event and significantly reduces defensive and feeding-response strikes. For juvenile Black-headed Pythons and any defensive individual, use the hook to lift the snake rather than reaching directly with the hand.

Support the full body weight at all times and move calmly and predictably. Sessions of 15-30 minutes several times per week are appropriate for well-settled adults. For Black-headed Pythons above 1.8 m, always have a second person present as a safety precaution — do not handle large adults alone. Always wash hands before and after handling. Never handle either species within 48-72 hours of feeding.

Deep, burrowable substrate is the single most important form of enrichment for both species. A snake that can construct and maintain its own stable burrow within the enclosure is expressing its most fundamental natural behaviour, supporting both physical and psychological wellbeing. Varying substrate composition and depth, and placing hides partially buried under the substrate, further encourages burrowing activity.

Provide a variety of hide configurations — smooth ceramic caves, cork bark sections, rock-like hides and flat rocks placed over the substrate — and rotate or rearrange these during full substrate changes to provide novelty. Low-profile branches or rocks at ground level add structural complexity without encouraging climbing. For Black-headed Pythons, a soaking bowl large enough for full immersion provides additional enrichment.

Varying prey presentation stimulates natural foraging behaviour: dragging a thawed prey item across the enclosure to create a scent trail, or placing it in a different location than usual, encourages tongue-flicking and active investigation. Periodic supervised out-of-enclosure exploration in a safe, escape-proof space provides novelty and physical exercise for well-settled adults of both species.

Respiratory infections are the most common health concern in captive Aspidites pythons, typically caused by enclosure temperatures that are too low or by draughts. Signs include wheezing, open-mouth breathing and mucus discharge. Verify temperatures immediately and seek veterinary attention promptly — untreated respiratory infections can progress to pneumonia.

Ectoparasites (snake mites) can be challenging to eradicate once established. Inspect the snake and enclosure regularly and treat with a veterinarian-recommended product, thoroughly disinfecting the enclosure and all furnishings simultaneously. Internal parasites (worms) may impact body condition and appetite; routine faecal checks by a reptile-experienced veterinarian are recommended.

Obesity can develop if prey is offered too frequently or is consistently oversized. Monitor body condition regularly — the spine should not be prominently visible, but there should be no excessive lateral rounding. Incomplete shedding is usually linked to insufficient humidity; provide a damp hide and lightly mist the substrate during shed cycles. Burns can occur if heat sources are not properly thermostat-controlled — always verify surface temperatures with a temperature gun.

Woma Pythons specifically: their vigorous feeding response creates a risk of swallowing feeding tongs or other implements. Always use tongs of adequate length and remove them immediately after the snake strikes. Foreign body ingestion requires immediate veterinary attention.

Black-headed Pythons specifically: females incubating eggs can become significantly more defensive — plan enclosure access accordingly and minimise disturbance during the incubation period.

Regurgitation in both species may result from handling too soon after feeding, incorrect temperatures or stress — always observe the 48-72 hour post-feeding handling restriction. Any signs of wheezing, retained shed, unexplained weight loss, regurgitation or behavioural changes should be assessed by a reptile-experienced veterinarian promptly.