Gerbil Enrichment: Deep Bedding Alone Does Not Stop the Digging

Gerbil Enrichment: Deep Bedding Alone Does Not Stop the Digging

Almost every gerbil care sheet tells you to provide deep bedding. The research says that is roughly half the answer. For everything else about them, see our complete Gerbil care guide.

What the Research Actually Says

Christoph Wiedenmayer studied stereotypic digging in gerbils at the University of Zurich and published the result in Animal Behaviour in 1997.

The findings, in order of how much they should change your setup:

Cage size did not affect the digging. Bigger enclosure, same behaviour. Whatever is causing it, it is not simply confinement.

The burrow is the goal. Wild gerbils dig burrow systems of chambers connected by tunnels, and Wiedenmayer's reading is that digging is directed at producing that structure. In a cage where digging can never produce one, the behaviour runs without ever completing.

Tunnel-and-chamber dens prevented it. Sand did not, or not nearly as well. Gerbils raised with an artificial burrow available did not develop the stereotypy. Offering a substrate to dig in was much less effective.

Later work on laboratory gerbil housing has reinforced the same direction, with opaque tubing assessed against stereotypies and refinement guidance recommending burrow structures rather than only deep bedding.

Build a Burrow, Not Just a Bedding Layer

The item the evidence directly supports, and the one that makes this guide different from most gerbil advice.

Deep aspen shavings that hold a tunnel shape are the base, and other sizes and volumes are available. Then put an actual structure in it: composable tunnel sections buried in the substrate and leading to an enclosed chamber, so there is a tunnel that arrives somewhere. Pressed plant fibre rather than plastic, so it doubles as chewing material and degrades and gets rebuilt the way a real burrow does.

A hideout partly buried and connected by a tube covers the chamber half. The point is the connection between the two, because that is the structure the study identified. Our tank setup guide covers bedding depth and enclosure dimensions.

Cardboard tubes work as a starting version and gerbils will destroy them quickly, which is fine and also why a rigid option is worth having as the permanent one.

Depth, Still

None of the above replaces bedding depth. Gerbils excavate, and a shallow layer with a tunnel sitting on top is not a burrow either.

Deep enough that a gerbil can dig down into it and have the tunnel hold, which for most setups means considerably more than a bag's worth. This is the most common corner cut in gerbil keeping and it is also the cheapest thing to fix.

Chewing, Constantly

Open-rooted incisors that grow for life, and a gerbil with nothing to chew will chew the enclosure. Natural chew sticks plus cardboard, untreated wood and plain paper give both the dental outlet and something to shred.

Shredding material is nest building as much as chewing, and it is worth providing generously rather than as a token. Our health issues guide covers what happens when incisors go unchecked.

A Pair, Not a Single

Social animals. Same-sex pairs or small groups, ideally littermates or animals introduced young, since introducing unfamiliar adult gerbils is genuinely difficult and can go badly.

A solitary gerbil is a poorer setup, not a simpler one. Our handling guide covers introductions and what a declanning looks like when a pair falls out.

Sand for Bathing, Which Is Different From Sand for Digging

Worth separating, because the study makes the distinction matter. A sand bath is for coat condition and is genuinely enriching. It is not the burrow substitute the digging research was testing against.

Offer it as a dish or house for short periods rather than leaving it in permanently, since it will end up scattered and soiled.

Space to Run

Floor area and levels. Gerbils are active and use height when it is given to them, and a wheel with a solid running surface is a reasonable addition, since an open-rung wheel risks tail and limb injury.

Space is not the fix for stereotypic digging, per the research, and it is still worth having on its own terms.

Priority Order

1. A tunnel connected to a chamber, buried in the substrate
2. Bedding deep enough to dig into and hold shape
3. A same-sex pair or small group
4. Constant chewing and shredding material
5. A sand bath, offered in sessions
6. Floor area, levels, and a solid-surface wheel
7. Rearranging and novelty, last

What Not to Do

Do not assume deep bedding alone prevents stereotypic digging, since the study tested exactly that and it underperformed a burrow. Do not buy a bigger cage expecting the corner digging to stop, because cage size made no difference. Do not keep a gerbil alone. Do not use an open-rung wheel. Do not use cotton wool or fluffy commercial nesting fibre, which is an entanglement risk. And do not introduce unfamiliar adults casually, covered in our handling guide.

For the rest of their care, see our Gerbil cost guide, feeding guide, and gerbil versus hamster comparison, or browse the rest of our Small Mammals care guide category.

Sources & Further Reading