Two-lined night adder
Causus bilineatus
A venomous and robust African night adder aesthetically distinguished by two striking pale longitudinal lines running straight down its head and upper anterior body.
Environnement
Terrestre
Humidité
55 - 75 %
Température diurne
22 - 26 °C
Température ambiante
22 - 26 °C
Température nocturne
18 - 20 °C
Point de repos chauffant
30 - 31 °C
Taille adulte
60 cm
Enclos minimal
>= 120 L
Description de l'espèce
Geographical Origin and Habitat: This species is primarily found in the grasslands, moist savannas, and woodlands of Central and Southwestern Africa, with documented records in Angola, Zambia, the Democratic Republic of the Congo, and Rwanda. It frequents areas characterized by significant seasonal rainfall and abundance of low herbaceous vegetation, often near marshes or the shores of freshwater bodies where amphibians are present in large numbers.
Taxonomy and Genetics: Causus bilineatus belongs to the family Viperidae, subfamily Causinae. Initially described as a variant or subspecies, it has been defined as a distinct species due to clear diagnostic morphological characters, particularly the light lateral lines. It shares the unique venom biology of the genus Causus, which includes remarkably elongated venom glands located along the body rather than restricted to the head.
Behavior and Habits: It is a terrestrial species, active both day and night depending on temperatures and seasons. It has a relatively shy temperament and prefers to flee if disturbed. However, if cornered or harassed, it raises the front of its body and hisses loudly. It spends much of its time hidden under fallen logs or in dense bushes, actively hunting frogs and toads.
Morphology: The body is cylindrical and of medium build, with a total length in adults ranging from 35 to 55 centimeters. The head is slightly distinct from the neck and features eyes with round pupils, unlike many other vipers. The ground color is light brown, grayish, or olive, characterized by two pale longitudinal stripes (whitish or yellowish) running along the sides of the back, from the head to the tail.
Soins, reproduction et cohabitation
Terrarium Setup: An 80x40x40 cm terrarium is suitable for a single adult. It is essential to set up a porous, semi-humid substrate such as peat mixed with coconut fiber, kept slightly damp but never soaked. It is recommended to provide numerous low branches, pieces of cork bark, and sturdy fake or live plants (such as Pothos) to recreate the natural vegetative cover of the native habitat.
Lighting and Heating: The thermal gradient must be carefully regulated: 24-26 °C in the cool zone and a hot basking spot at 30-31 °C managed by a shielded heat lamp. At night, the temperature should drop to about 19-21 °C. The use of a UVB neon tube (5.0 T5) turned on for 10-12 hours a day is recommended to support metabolism and maintain stable daily activity rhythms.
Humidity and Hydration: Optimal humidity should be around 55-65%, increasing slightly via controlled misting during the skin-shedding phases. A stable and heavy water bowl must always be placed in the terrarium to allow constant hydration. The water must be changed daily to prevent harmful bacterial proliferation.
Feeding and Supplementation: Being a specialized predator of amphibians, the diet in captivity must reflect this need. If rodents are used, it is necessary to apply the scenting method by rubbing the mouse on amphibians before feeding. Growing specimens should be fed weekly, adults every 10-14 days. Supplement with calcium and multivitamins containing D3 at least once a month.
Compatibility: The species must be housed individually to prevent stress and potential mutual injuries. Being a venomous animal, its housing must take place in a terrarium equipped with safety locks and positioned in a controlled-access room. The keeper must have adequate equipment for safe handling.
Health and Common Diseases: Primary health risks are related to dehydration and shedding problems (dysecdysis) due to inadequate humidity. Respiratory infections are common if terrarium ventilation is insufficient in the presence of high humidity. It is essential to monitor general health and consult a reptile veterinarian for periodic checks of intestinal parasites.
Origine et répartition géographiques
This species is primarily found in the grasslands, moist savannas, and woodlands of Central and Southwestern Africa, with documented records in Angola, Zambia, the Democratic Republic of the Congo, and Rwanda. It frequents areas characterized by significant seasonal rainfall and abundance of low herbaceous vegetation, often near marshes or the shores of freshwater bodies where amphibians are present in large numbers.
Origine
Afrique et Madagascar
Profil de reptile
- Régime alimentaire
- Carnivore
- Causus bilineatus primarily feeds on a diet of small mammals, amphibians, and occasionally birds in its natural habitat. In a captive environment, they can typically be transitioned to pre-killed rodents of appropriate size. It is important to offer varied prey items to ensure a complete nutritional profile. Feeding frequency should be adjusted based on the individual's age, size, and metabolic rate, generally ranging from every one to two weeks.
- Taille adulte
- 60 cm
- Mode de vie/microhabitat
- Terrestrial
- In its natural habitat, Causus bilineatus generally adopts a terrestrial lifestyle, although some climbing behavior may occasionally be observed. They rely heavily on ground cover, such as dense vegetation, rocks, and fallen logs, to navigate their environment safely. The enclosure design must incorporate ample horizontal space with a deep, naturalistic substrate to allow for burrowing and hiding. Providing multiple terrestrial hides across a temperature gradient is crucial for their well-being. Ensuring a secure and complex ground-level environment will encourage natural exploration and security.
- Cycle d'activité
- Nocturnal
- The activity pattern of Causus bilineatus is largely dictated by environmental temperatures and prey availability. They are predominantly crepuscular or nocturnal, becoming most active during the cooler evening and nighttime hours. During the heat of the day, they prefer to remain hidden in burrows, under leaf litter, or within crevices to thermoregulate. Keepers should align feeding and maintenance schedules with these natural active periods to reduce stress. A properly controlled photoperiod with distinct day and night cycles will help maintain their natural rhythms.
- Sociabilité
- Solitary
- Causus bilineatus exhibits a range of fascinating behaviors that are characteristic of its genus. They are generally solitary creatures, relying on camouflage and stealth to avoid predators and ambush prey. When threatened, they may display defensive postures, such as coiling tightly or producing warning sounds, before striking. In captivity, observing these natural behaviors requires providing a spacious and enriched environment that mimics their natural habitat. Regular monitoring is essential to ensure they remain unstressed and behave naturally.
- Reproduction
- Oviparous
- The reproductive strategy of Causus bilineatus is well-adapted to its natural environment, ensuring the survival of the next generation. Depending on the specific lineage, this species may exhibit viviparous or oviparous reproductive behaviors, requiring specific conditions for successful breeding. Careful temperature cycling and environmental conditioning are often necessary to stimulate reproductive activity. Providing adequate nesting sites or safe birthing enclosures is critical to prevent stress and ensure the health of both the mother and offspring.
- Tolérance aux manipulations
- Display only
- Handling Causus bilineatus should only be attempted by experienced professionals due to their highly venomous nature and potential for rapid strikes. Direct physical contact must be strictly avoided to prevent life-threatening envenomation incidents. Specialized tools, such as snake hooks and secure transport tubes, are absolutely necessary for any necessary movement or husbandry tasks. Always maintain a clear understanding of the animal's behavior and strike range during maintenance. A comprehensive safety protocol and access to appropriate antivenom should be established before acquiring this species.
- Brumation
- Non requise
- To mimic seasonal changes, Causus bilineatus may require a period of brumation, especially if breeding is intended. This involves a gradual reduction in temperature and light hours over several weeks, leading into a sustained cooler period. During brumation, feeding should cease completely, but fresh water must always remain available. The animals should be closely monitored for any signs of weight loss or respiratory distress during this vulnerable time. After the cooling period, temperatures and feeding are slowly brought back to normal active levels to simulate the onset of spring.
- Mue
- Regular
- The molting process, or ecdysis, is a critical period for Causus bilineatus that requires optimal environmental conditions. Proper humidity levels must be maintained to ensure the skin is shed entirely in one piece, preventing retained sheds that can cause infections. As a shed approaches, the snake's eyes will turn a cloudy blue, and they may refuse food and become more reclusive. Providing a humid hide box can significantly aid the shedding process and ease any associated stress. Keepers should inspect the shed skin to confirm that the eye caps and tail tip have been successfully removed.
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