A 36×18×18" is about 90×45×45 cm, a floor-space enclosure, so it suits ground-dwelling species that need room to roam. Here is what suits it as a permanent adult home, from most to least common.
35 species can suit a 36×18×18" as an adult, based on conservative minimum footprints. Bigger is always better.
Ground-dwelling nocturnal gecko needing floor space, a humid hide, and warm ground gradient.
Cool, humid, low-light terrestrial gecko needing plenty of hides and no bright basking zone.
A 3×1.5 ft floor is the adult minimum; ground space over height.
Tiny arboreal, all-female colony gecko needing a planted vertical vivarium with plenty of cover.
A tiny arboreal bamboo-dweller; a planted, vertical 30x30x45 cm (12x12x18 in) bioactive viv suits a pair, with bamboo and cork to climb.
Cool, humid woodland amphibian needing a low, planted, heavily-hidden floor with deep damp substrate; keep it cool, never heated.
Terrestrial skink needing deep, moisture-retaining substrate for burrowing and hides.
Small, shy terrestrial species needing a humid, heavily planted setup with a water area and hides.
Terrestrial burrowing amphibian needing a low, cool floor with deep, damp substrate; floor space over height, and no heat lamp.
Small, cool-and-humid, delicate; a densely planted viv suits a pair, keep them low-stress.
A compact 3x1.5ft footprint suits this small, hardy python.
A 3x1.5ft floor with a large water area for these active, diurnal foragers.
A 2×1.5 ft footprint with deep substrate, depth matters for a burrower.
A dry 3x1.5ft floor with a tight lid; they push through any loose gaps.
A small, low 2x1.5ft floor with deep substrate for this cool-loving burrower.
A 3×1.5 ft floor with deep substrate to burrow.
A large arboreal treefrog needing height and sturdy broad-leaf plants.
A small, active arboreal frog; a couple suit a planted vertical terrarium.
Fully aquatic: needs a long, cool, filtered tank (about 90 cm / 20 gal+), never a terrestrial viv.
A planted bioactive viv; a small group fits an 18x18x18 in, species and numbers vary.
Semi-aquatic and social; a small group needs a land area plus a clean water section.
Hardy small arboreal frog needing height, cover and a seasonal cool period.
Tiny, diurnal, toxic-in-the-wild frog; a bioactive floor-focused viv suits a small group.
A sit-and-wait ground frog: floor space and burrowing depth matter, height does not.
Arboreal and delicate; a planted, humid vertical viv suits a small group.
Terrestrial and stocky; prioritise floor space and a moisture-holding substrate.
A chunky arboreal frog; one adult suits a 45x45x45 cm setup, more height is welcome for climbing.
Arboreal: needs vertical height, anchor points and good airflow.
A gentle detritivore needing deep, moist substrate to burrow, floor space over height.
Social; needs a long tank with very deep substrate for moulting, plus fresh and salt water.
Large, very fast arboreal tarantula for experienced keepers; prioritise vertical space.
Arboreal and docile; give height with cork bark and a tall water-tight burrow.
Needs height at least 3x its body length to moult safely; one per enclosure.
Fast arboreal genus; height and cover over floor space, keeper experience recommended.
Harmless arboreal arachnid that presses flat against vertical cork bark; needs height.
Picked your species? Set it up in baskr and it tracks temperature, humidity, weight and more against the species ideal ranges, and flags problems early.
Start freeThese are conservative minimums for one adult, not targets to aim for, bigger and more enriched is always better. Group sizes, sex ratios and exact needs vary by species, always confirm with an up-to-date care sheet, an experienced keeper or an exotics vet before you buy an animal or an enclosure. baskr provides husbandry guidance, not veterinary advice.