10/13/2026
Did you know that roof rats (Rattus rattus) are being selectively bred in an attempt to domesticate them?
Most people are familiar with domestic fancy rats (Rattus norvegicus), but there is another species of rat that has lived alongside humans for thousands of years.
Roof rats, also known as black rats or ship rats, are a completely different species from our domestic fancy rats. They spread around the world alongside humans through trade and shipping, but living near people isn't the same thing as being domesticated.
So, can roof rats become domestic rats?
Apparently, someone is working on exactly that!
The Blonde Roof Rat Project is an ongoing selective-breeding project whose founder reports working with roof rats since 2018, selecting for traits such as tameness and willingness to interact with humans.
The goal is fascinating: to see whether generations of selective breeding can produce roof rats that are better suited to life in captivity and as companions.
Domestication isn't simply taking a wild animal and getting it comfortable with people. It's a process involving heritable traits selected across generations. Over time, selective breeding can change behavior, temperament, and other characteristics within a population.
Our domestic fancy rats are a wonderful example of how far selective breeding can take a species. Could roof rats eventually follow a similar path?
It's important to note that the Blonde Roof Rat Project's claims are primarily based on the project's own reports, and independent scientific confirmation of a fully domesticated roof rat population is still lacking.
Nevertheless, this is a fascinating project for anyone interested in rat behavior, genetics, selective breeding, and the history of domestication.
You can learn more about the project here:
https://blonderoofrat.com/about/
What do you think? Could Rattus rattus eventually become another established domestic rat species? Would you be interested in learning more about the genetics and challenges involved in domesticating a new rat species?
About Blonde Roof Rat: one keeper maintaining the only known domesticated colony of Rattus rattus, and why this site exists.