Yes, blonde rats are real. A blonde roof rat has a pale cream-to-amber coat with dark eyes, not the pink eyes of an albino. In our line the colour is a recessive Rab38-null trait we have confirmed by PCR, and it is the same pigment-trafficking gene that makes fancy rats “fawn” and mice “chocolate.”[1]
What is a blonde rat?
A blonde rat is a rat whose coat is a light cream-to-amber colour instead of the usual banded brown (agouti) or black. In our roof rats (Rattus rattus) it is one of the colours that arose naturally in the line, alongside agouti, black, and a white tail-tip marking. The word is sometimes spelled blond rat. The key tells that it is a true blonde and not an albino: the eyes are dark, and the coat has warmth to it rather than pure white.
What does a blonde rat look like?
Cream to soft amber over the back, often a little lighter on the belly, with dark eyes and pink ears and tail. Next to an agouti or black littermate the difference is obvious. You can see our blondes alongside the other coats in the gallery on The Project and on the roof rat colours and coat genetics page.
Blonde rat genetics: how the colour is inherited
Blonde is recessive: a rat needs two copies of the Rab38-null gene to show the colour, so two non-blonde parents can still produce blonde pups if both carry it. Rab38 helps move pigment inside the cells that colour the coat; when it does not work, the coat lightens. It is the same well-characterised change that turns Norway rats fawn and mice chocolate,[1] and we have confirmed it in our rats by PCR testing of hair samples. For the full colour genetics, including how blonde interacts with agouti and black, see the coat genetics page.
Blonde vs beige vs fawn: how to tell the difference
These names all describe a lightened coat, and which one you use depends on the species and the exact shade. Fawn is the amber colour in Norway (fancy) rats, and a true fawn often has ruby-tinted eyes. Beige is a paler, cooler version. Our blonde roof rats sit in the cream-to-amber range with clearly dark eyes. The practical test is the same in every case: warmth in the coat plus dark eyes means a pigment gene is dialled down, not switched fully off as in an albino.
Are blonde rats rare?
Because blonde is recessive, it only shows when a pup inherits the gene from both parents, so it appears less often than agouti or black unless you deliberately pair carriers. In our line we track which rats carry it and can plan pairings, so blonde is uncommon but far from a fluke. In the wider world, a domesticated blonde roof rat is genuinely rare simply because so few people breed roof rats as pets at all.
Do blonde rats have any health differences?
In day-to-day life our blondes are as healthy and friendly as any other colour. The one honest caveat is that Rab38 does a little more than colour: it also helps build the lamellar bodies that store lung surfactant, and in a Rab38-null rat model that pathway is affected,[2] which is part of why a confirmed Rab38-null blonde is such an interesting research animal. This is background biology, not a warning; we have not seen blonde-specific health problems in the colony. The Rab38 deep dive follows that thread in full.
Blonde roof rats vs blonde fancy rats
A blonde fancy rat is a lightened Norway rat (Rattus norvegicus); a blonde roof rat is a different species (Rattus rattus), slimmer and more of a climber, and in our case bred for tameness. The pigment idea is similar, but the animals are not the same, and the two species cannot interbreed. For a side-by-side of the two, see roof rat vs Norway rat. If you want the pet-keeping and species background, start with roof rats as pets.
Common questions
Are blonde rats real?
Yes. A blonde rat has a pale cream-to-amber coat and dark eyes. In our roof rats it is a real, heritable coat colour we track across generations, not a one-off or a trick of the light.
Are blonde rats albino?
No. An albino rat has no pigment at all and pink or red eyes. A blonde rat still has dark eyes and a warm cream-to-amber coat; the colour comes from a specific pigment gene, not from a total lack of pigment.
Is a blonde rat the same as a fawn or beige rat?
They are related ideas from the same kind of pigment change, but the names differ by species and shade. Fawn is the amber colour in Norway (fancy) rats; our blonde roof rats carry the same gene, sometimes spelled blond rat, in a cream-to-amber shade with dark eyes.
References
- [1] Loftus SK et al. “Mutation of melanosome protein RAB38 in chocolate mice.” Proceedings of the National Academy of Sciences 2002;99(7):4471-4476. PubMed.
- [2] Osanai K et al. “Exogenous gene transfer of Rab38 small GTPase ameliorates aberrant lung surfactant homeostasis in Ruby rats.” Respiratory Research 2017;18:70. PubMed.