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Strictly speaking, a terrarium originally referred to a planted enclosure built around live vegetation, closer to a small indoor garden than a housing unit for an animal. A vivarium, by contrast, technically refers to any enclosure built to house a living creature, whether that's a this reptile supplies retailer, amphibian or invertebrate, with or without live planting. In practice, though, UK retailers and keepers use both terms fairly loosely, often depending on regional habit or supplier naming rather than any strict definition.

Northampton Reptile Centre's in-store and online range lays out enclosures, heating, lighting and substrate side by side, which makes it easier to see how the pieces fit together rather than guessing from separate listings on different sites. Staff on the shop floor handle these setups day to day and can talk through what a particular species actually needs versus what's optional.

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For a new keeper, the practical takeaway is that the terminology matters far less than what the enclosure actually needs to do for the species inside it. A product listed as a vivarium and one listed as a terrarium might be functionally identical, or they might differ significantly in ventilation, material and intended use. What matters is checking the specification, the dimensions and the ventilation against what a given species actually requires, rather than assuming the label tells the full story.

Hides matter more than new keepers often expect. Most reptiles need at least a warm-end hide and a cool-end hide so they can thermoregulate by choosing where to sit, and a nervous animal without anywhere to retreat to will show it in its behaviour.

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