Boa Constrictor — care sheet

Intermediate. Docile and hardy — the calmest of the big snakes — but it uses the same care as a corn or ball python scaled up hugely. Expect a room-sized enclosure, a strong adult that warrants two-person handling, and a 30-year commitment. Easy temperament, big-animal logistics.

Carnivore fed whole prey — appropriately-sized frozen/thawed rodents (and, for variety, the occasional chick or quail). Boas are NOT stretchy like pythons: a correct meal leaves only a subtle lump, and oversized prey causes dangerous regurgitation. Feed on an infrequent, varied schedule and adjust to body condition — slow feeding is linked to boa longevity, and power-feeding causes obesity.

Sized to the snake (rule of thumb: length × ½ length × ½ length). An adult of 6–8 ft needs a minimum 6×3×3 ft; a large adult over 8 ft needs 8×4×4 ft. They are SEMI-ARBOREAL, so give real height and sturdy branches as well as floor space. Large enclosures are hard to buy — many keepers build their own. House ONE.

Warm/basking surface 86–90°F (30–32°C) from an overhead heat source — a ≥2-bulb halogen cluster over a proper-size enclosure heats a big coiled body far better than a single bulb or a heat mat.

Cool end 75–80°F (24–26°C), for an overall 75–90°F thermal gradient the snake can move through.

Night can fall to about 68°F (20°C). Boas benefit from a seasonal cool-down even if you never breed — a cooler, shorter-day winter (down to ~75–78°F) is natural for them.

UVB is beneficial (increasingly recommended, though not strictly required): a T5 HO bulb (Arcadia 6%) giving UVI 2.0–3.0 at the basking spot, at the correct Ferguson-zone distance. Replace every 12 months.

Ambient 55–75%, rising to 75–85% during a shed for a clean, one-piece slough. Mix water into a deep substrate (don’t just pour) or use a cool-mist fogger; avoid a chronically wet, stale enclosure.

A moisture-holding mix at least 2–3 in deep (deeper is better) — a topsoil / coconut-fibre / play-sand blend holds humidity and lets them burrow, which they occasionally do. Never cedar or pine (toxic oils).

A whole-prey diet is largely complete, but because feeder rodents can be nutrient-poor, lightly dust prey with a calcium/multivitamin now and then. Replace supplements every 6 months (the vitamins degrade).

Commonly 5–8 ft (subspecies-dependent); females larger, and giants reach 10–12 ft

Up to 30 years with good care — a genuine multi-decade commitment

See a reptile or exotics vet if you notice: Open-mouth breathing, wheezing, clicking, or mucus/bubbles (possible respiratory infection — common in boas kept too cool or damp-stale).; Regurgitating meals (often from prey that is too large, handling too soon after feeding, or temps too low).; Chronic "stargazing", corkscrewing, or an inability to right itself, especially with regurgitation and wasting (possible Inclusion Body Disease — a serious viral illness boas are known carriers of).; Repeated stuck sheds or retained eye caps despite correct humidity; cheesy matter in the mouth (mouth rot); or mites (tiny moving dots).; Obvious obesity (spread scales, no taper) from overfeeding, or any tissue protruding from the vent (prolapse)..