Multi-level rat cages: what a study on space use changes about furnishing
Published by Planète Pets · managing editor: Clément Lacaille · how our guides are written
Our guide on choosing a cage for a rat covers recommended height and number of levels, but a spatial cognition study adds useful context on how rats actually use those levels. Published in 2011 by Jovalekic, Hayman, Becares, Reid, Thomas, Wilson and Jeffery in Behavioural Brain Research, it focuses specifically on how rats explore three-dimensional space (see the study). Our other equipment guidance is gathered in the rodent accessories section.
Contents · 4 sections
The "layer strategy" observed in the lab
Watching rats move through a multi-level apparatus, researchers found a clear bias toward horizontal movement over vertical movement. Rather than freely mixing climbing, descending and sideways moves, rats tended to explore one horizontal level almost completely before switching to another — a strategy the authors describe as processing three-dimensional space in successive layers.
What this means for furnishing
If each level is treated as its own territory to explore before the rat moves on, a level reduced to a narrow plank offers far less value than a level with real usable surface — a hammock, a solid platform, a few centimetres of depth to stop, sniff around or perch. It is worth favouring fewer, more generous levels over stacking many narrow ones just to maximise total height. Ramps remain the best connector between levels, in line with what our cage guide already recommends; this study mainly explains why the quality of each level matters as much as their number.
The study's limits
The experiment took place in an apparatus designed to test spatial cognition, not in a home cage furnished with hammocks and tunnels, and used laboratory rats. The horizontal bias observed describes a general tendency in how space is processed, not a furnishing protocol tested at full scale; it nonetheless lines up with existing recommendations around solid platforms and ramps.
Frequently asked questions
Should I give up on a tall cage for a rat?
No: height still helps multiply usable surface without increasing the floor footprint, as long as each level offers real surface rather than just a walkway plank.
So how many levels should I plan for?
Quality matters more than count: two or three spacious levels well connected by ramps beat five narrow ones. Find all our guides on the rodent hub.
See it in the Planète Pets shop: Natural loofah chew carrot for rabbits and rodents, 20 cm (€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.
