Why a gerbil digs nonstop: it isn’t a toy that’s missing, a study shows
Published by Planète Pets · managing editor: Clément Lacaille · how our guides are written
A gerbil that scratches endlessly at the same corner of its cage, or gnaws the lid bars without let-up, isn’t necessarily asking for another toy. A Swiss study looked for the exact cause of these two repetitive behaviours, with a result that shifts the question toward housing setup rather than accessories. Our other cage-equipment guidance is gathered in the rodent accessories section.
Contents · 4 sections
Two stereotypies, two separate causes
Published by Waiblinger and König, researchers at the University of Zurich, the study examined laboratory gerbils housed in standard cages, in which two stereotyped behaviours commonly develop: repeated digging at the same spot and gnawing the lid bars (, Altex 24(special issue):67-69, see also the expanded version in Animal Welfare 13:S229-235). Rather than testing generic enrichment, the researchers isolated the precise cause of each behaviour.
Stereotyped digging turned out to be directly linked to the lack of a burrow in the cage: a wild gerbil spends most of its life underground, and substrate too shallow to allow a real burrow was enough to trigger the repetitive behaviour. Bar-gnawing, by contrast, was caused neither by a lack of chewing material, nor by the bars’ proximity to the food hopper, nor by cage changes — but by young gerbils being separated early from their parents, before the next litter was born.
What the study tested and ruled out
This point is worth stressing: the researchers explicitly tested and then ruled out a lack of chewing material as the cause of bar-gnawing. Adding chew sticks without changing the timing of family separation therefore doesn’t fix the behaviour at its root, even though it still helps with tooth wear.
What this changes for a gerbil cage
To limit stereotyped digging, a substrate bin deep enough for a gerbil to build a real network of tunnels matters more than a digging toy. To limit bar-gnawing in a young gerbil, delaying separation from the parents matters more than adding chew sticks — treating the cause rather than the symptom. These points sit alongside another burrowing species covered in our article on repeated-handling stress in degus, and complement our article on gerbil hearing sensitivity for choosing accessories overall.
Frequently asked questions
Can a digging toy replace deep substrate?
No, according to this study: it’s the depth of the substrate that allows a real burrow, not the presence of a standalone play accessory.
At what age can young gerbils safely be separated from their parents?
The study doesn’t set a precise age, but shows that separation before the next litter is born increases bar-gnawing; it’s better to let the family group re-form naturally. Find all our guides on the rodent hub.
An accessory from our shop for this use: Hanging chew garland for rabbits and rodents (€17.90) · the whole shop
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.
