Mice prefer a nest box with a single entrance, a Dutch study shows: a simple criterion to check
Published by Planète Pets · managing editor: Clément Lacaille · how our guides are written
Faced with several possible hiding spots, a mouse doesn't choose at random: a Dutch study measured a clear preference for one specific nest box shape. Find our accessory comparisons in the rodent accessories section.
A Dutch study on nest box preferences
Van de Weerd, Van Loo, Van Zutphen, Koolhaas, and Baumans published a study on nest box preferences as enrichment in laboratory mice in the journal Animal Welfare in 1998 (see the study). Testing six nest boxes made of different materials, the researchers measured an overall preference for a grid-metal nest box over clear or white perspex versions, and above all a marked preference for a box with a single opening over one with two opposite openings, with mice consistently settling with their heads facing the single entrance.
What this means for choosing a hideout
This result gives a simple, checkable criterion when buying or building a hiding spot for a pet mouse: shape matters at least as much as size or material. A pass-through shelter with an opening on each side leaves a mouse exposed from both directions at once, while a single-entrance hideout lets it watch the one access point while staying covered the rest of the way around.
- Favor an enclosed hideout with a single entrance over a tunnel open at both ends for the main nest.
- Offer several such hideouts in a cage housing multiple mice, since each may want its own refuge.
- Make sure the entrance stays clear and isn't wedged against a wall, so the mouse can watch its surroundings from inside.
This criterion rounds out the profile covered in the fancy mouse profile and on the fancy mouse accessories page. Our article on setting up a mouse cage covers the other essential accessories.
Frequently asked questions
Should a tunnel open at both ends be avoided entirely?
No, it still has value as a passage or a route element; it's mainly for the main hideout, the one where the mouse sleeps, that a single entrance is preferable.
Does the nest box material really matter?
The study measures a preference for wire mesh over perspex in a lab setting; in a home enclosure, opacity and sturdiness of the material likely matter more than the exact material itself.
Does this also apply to hamsters or rats?
The study covers mice specifically; other rodents also show a preference for enclosed shelters, but with data specific to each species. Find all our guides on the rodent hub.
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This guide is part of Planète Pets’s Rodents universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.