If you are choosing between pill millipedes and giant millipedes, the main difference is straightforward: pill millipedes are compact, domed and more substrate-focused, while giant millipedes are longer, more obvious display animals. From there, the key decision points are size, visibility and how each type fits your enclosure.
A pill millipede is usually the better fit if you want something small and subtle that spends much of its time in the substrate. A giant millipede is more likely to appeal if you want a larger animal that is easier to see and has a stronger visual presence. If you are still at the research stage, our Millipede Beginner & Buyer Guides are a good next step, and How to Start Keeping Millipedes covers the basics of getting set up properly.
Pill millipedes vs giant millipedes: what's different?
Pill millipedes are short, rounded and strongly domed. When they roll up, they can look like tiny armoured capsules. Giant millipedes are much more elongated, with a long cylindrical body made up of visible segments, so they have the classic millipede look most people picture.
That shape difference affects both appearance and enclosure use. Pill millipedes are visually compact and often easy to miss, even when the setup itself is well stocked with substrate and leaf litter. Giant millipedes take up more visual space, are usually easier to observe, and tend to feel more like display animals.
Adult size matters too, but not just as small versus large. Pill millipedes may be small-bodied, yet they still need the right substrate depth and moisture balance for the species. Giant millipedes can become much larger, but their care still depends on species-specific needs rather than size alone.
Which differences matter most
For most keepers, the practical differences come down to enclosure footprint, visibility and how the habitat is used. Pill millipedes are often chosen for a more substrate-focused setup with deep, moist material and plenty of decaying organic matter. Their smaller size does not mean their enclosure can be casual; moisture, ventilation and substrate quality still need to be carefully balanced.
Giant millipedes usually need more room for length, turning and movement, and a setup that gives them enough substrate to burrow, rest and feed comfortably. They are generally easier to see in the enclosure, but they may still spend long periods hidden depending on the species.
Both groups are detritivores and both need leaf litter, decaying wood and stable humidity, but the exact balance varies by species. That is why general advice is only a starting point. If you want a species-by-species comparison, the Millipede Species Guide is the best place to look before buying.
In practice, pill millipedes suit keepers who are happy to focus on the habitat and watch a smaller animal move through the substrate. Giant millipedes suit keepers who want a larger millipede that is easier to notice and appreciate when it is out and about. Neither group is inherently better; they simply reward different expectations.
Who each option may suit
Pill millipedes may suit you if:
- you want a compact, unusual species
- you prefer a more substrate-focused animal
- you are comfortable managing a carefully controlled moist habitat
- you are interested in smaller, more cryptic millipede keeping
Giant millipedes may suit you if:
- you want a larger, more imposing animal
- you prefer a millipede that is easier to see
- you have space for a bigger enclosure
- you want size and presence to be part of the appeal
If you are deciding between them for the first time, start with How to Start Keeping Millipedes for setup basics, then use the Millipede Species Guide to compare species-level differences. Once you have chosen a type, the Pill Millipede Care Guide and Giant Millipede Care Guide provide the next layer of detail.