If you are comparing giant and small millipedes, the decision usually comes down to enclosure space, how visible you want the millipede to be, and the kind of display you are trying to create. Adult size affects all three, so it is worth comparing the species themselves rather than relying on the size label alone.

If you want a broader overview before choosing, our Millipede Beginner & Buyer Guides and How to Start Keeping Millipedes pages are a good place to start.

What's different between giant and small millipedes?

The main difference is simple: giant millipedes have a much stronger physical presence, while small millipedes are more compact and easier to house in a smaller setup. In practical terms, that usually means giant species need more room, while smaller species can fit better into limited shelf or display space.

Visibility is the other major difference. Giant millipedes are usually easier to notice because of their size alone, while small millipedes may feel more subtle unless they are active on the surface. That means a large species does not automatically give you the most active display, and a smaller species is not necessarily less interesting to watch.

Appearance also varies. Giant species often appeal because they look substantial and striking, while smaller species may be chosen for their finer shape, banding or more delicate overall look. If display value matters to you, size is only part of the decision.

For a broader comparison of different types, the Millipede Species Guide can help you see how size, behaviour and looks vary across the hobby.

Which differences matter most

For most buyers, the key questions are not just how big the millipede will get, but how it will fit into your enclosure and how often you expect to see it. A larger species may suit a more spacious display, while a smaller one may be easier to place in a compact setup.

Care still varies by species, so substrate, moisture and feeding should always be matched to the millipede you choose rather than to size alone.

Another useful distinction is surface activity. Some species are seen regularly moving across the top of the enclosure, while others spend much more time in the substrate. If you want to enjoy the animal visibly, that matters as much as whether it is giant or small.

Maintenance can also feel different. Larger millipedes are easier to spot during checks, while smaller species can be less obvious among leaf litter and substrate. That does not make one better than the other, but it does affect how the enclosure feels day to day.

Who each option may suit

Giant millipedes may suit keepers who want a more imposing display animal, have room for a larger enclosure and prefer a millipede with strong visual presence. If you want the animal to be the main feature in the tank, a giant species is usually the better fit.

Small millipedes may suit keepers who want a compact setup, have limited space or prefer a subtler display. They are also a good match if you like a more delicate shape or want something that fits neatly into a smaller enclosure or shelving system.

For comparing actual species side by side, see our Giant Millipedes and Small Millipedes collections. Looking at the species themselves is the best way to decide which size category fits your space and the style of display you want.

In short: choose giant millipedes if you want presence and a larger display, or small millipedes if you want a compact setup and subtler visibility.