Published July 15, 2026

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"Terrarium" and "vivarium" get used as if they mean the same thing. They overlap, but the distinction is useful: it tells you whether you're building for plants, for animals, or for a full living system — and that decision shapes everything from substrate to lighting.

What a terrarium is

Strictly, a terrarium is a glass enclosure focused on plants — a closed terrarium of moss and ferns, or an open planted display. Animals may be absent entirely. The design priority is the plants and the look.

What a vivarium is

A vivarium is an enclosure built to house living animals in a naturalistic habitat — reptiles, amphibians, or invertebrates. Here the animal's needs lead: temperature gradient, humidity, ventilation, and space appropriate to the species. Plants support the animal rather than being the point.

Where bioactive fits

"Bioactive" isn't a third box — it's a method that can apply to either. A bioactive setup adds a living clean-up crew and plants so the enclosure processes its own waste. You can have a bioactive planted terrarium with no animals, or a bioactive vivarium built around a gecko.

Paludarium and other cousins

Once water enters the picture the names branch further: a paludarium combines land and water, an aquarium is fully aquatic, a riparium sits in between. They're all variations on "an enclosed slice of an ecosystem."

Which one are you building?

Ask what leads your decisions. If it's the plants and the display, you're building a terrarium — start with our Terrarium Basics hub. If a specific animal's welfare leads, you're building a vivarium — begin with that species' care guide. The vocabulary matters less than being honest about which set of needs comes first.

Species and plant needs vary — check a current care sheet for your specific animal or plant before finalizing a setup.