Degus can see ultraviolet light: what that means for cleaning their cage
The Chilean degu (octodon) has a trait few owners know about: it can see ultraviolet light, a range invisible to us. A study by Andres Chavez, Francisco Bozinovic, Leo Peichl, and Adrian Palacios, published in 2003 in Investigative Ophthalmology & Visual Science, showed that the degu retina perceives ultraviolet light and that fresh degu urine strongly reflects it, unlike old urine, whose UV reflectance fades quickly (Google Scholar search). Find more care tips in our care and grooming section.
Urine that glows under UV
In this diurnal, social species, that ultraviolet reflectance works as a real visual marker between cage mates, on top of its usual scent role: a degu can literally tell where and when another degu passed through recently, since the freshness of the mark shows in how strongly it reflects UV light.
Why it matters for cleaning
A full, too-frequent cage cleaning wipes out all of these markers at once, both scent and visual, which can temporarily disorient the group and push degus to re-mark their territory intensively in the hours that follow. This echoes the broader point made in our article on cleaning the cage too often.
Clean by zone, not all at once
Good practice is to remove soiled spots daily and, during the more thorough weekly clean, keep a bit of already-marked substrate on one side of the enclosure rather than replacing everything at once. For overall sizing and setup suited to this social, climbing species, see our guide to what cage for a Chilean degu.
Frequently asked questions
Should you stop cleaning the degu's cage out of respect for its markings?
No, hygiene still matters; the point is simply to avoid replacing all of the substrate at once, too often.
Do other rodents see ultraviolet light too?
Several rodent species perceive some ultraviolet light, but the degu is one of the best-documented cases on this exact point, tied to its urine.
Does this change which bath sand to use?
No, choosing bath sand comes down to other criteria, covered in our guide to chinchilla and gerbil sand baths.
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.