False Water Cobra (Hydrodynastes gigas) Care Sheet

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Quick Facts

Scientific Name: Hydrodynastes gigas
Common Names: False Water Cobra
Origin: South America – Brazil, Bolivia, Paraguay, and Argentina
Adult Size: 180–250 cm (6–8 ft) in length; females generally larger and heavier than males
Lifespan: 12–20 years in captivity
Sex Differences: Females are larger and more robust; males are slimmer with longer tails
Beginner Suitability: Moderate – fast-growing, strong snakes that require careful handling and large enclosures

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Enclosure

Size: Juveniles can be housed in 90 cm x 45 cm x 45 cm (3 ft x 1.5 ft x 1.5 ft). Adults require a minimum of 180 cm x 90 cm x 90 cm (6 ft x 3 ft x 3 ft). Larger enclosures are strongly recommended due to their size and activity level.

Substrate: Use a mix of soil, coconut fibre, or cypress mulch to retain humidity. Avoid loose substrates that may cause impaction. Provide deep substrate for burrowing.

Hides: Provide multiple hides on both the hot and cool sides. Include cork bark, logs, or artificial caves for secure hiding.

Heating: Maintain a hot spot of 32–34°C and a cool side of 24–27°C. Night temperatures can safely drop to 21–23°C. Use heat mats, ceramic heat emitters, or basking bulbs with a thermostat.

Lighting: UVB is optional. Maintain a 12-hour light / 12-hour dark cycle.

Humidity: Maintain 60–80% humidity. Provide a large water dish suitable for soaking. Ensure proper ventilation to prevent mold and respiratory issues.

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Diet

Primary Diet Type: Carnivore

Food Items: Feed appropriately sized frozen-thawed rodents. Juveniles can also take fish or amphibians occasionally. Adults generally consume adult mice, rats, or small rabbits depending on size.

Feeding Frequency: Juveniles every 5–7 days. Adults every 7–10 days.

Feeding Troubleshooting: Ensure prey items are appropriately sized and fully thawed. False Water Cobras are fast feeders but can be defensive; use feeding tongs if necessary. Avoid live prey unless necessary.

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Water

Provide a large water dish for soaking and drinking. Water should be changed daily to maintain cleanliness.

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Behavior And Handling

False Water Cobras are generally nervous, defensive, and fast-moving. Handle with care and support the full body. Avoid handling shortly after feeding. They are solitary and should only be housed with others for breeding purposes.

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Enrichment

Include climbing branches, logs, and deep substrate for burrowing. Provide multiple hides and occasional rearrangement of décor to encourage exploration and activity.

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Health

Signs of illness include lethargy, refusal to eat, abnormal stool, respiratory issues, or swelling. Provide proper temperature, humidity, and diet. Consult a reptile-specialist veterinarian if issues persist.

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Lifespan

Typically 12–20 years in captivity, with some individuals living longer under optimal care.

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Legality In The UK

False Water Cobras are legal to keep in the UK. No licence is required for private ownership. Owners must comply with Welfare of Animals regulations.

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Difficulty Bars (Relative)