Do you have any other details, like the or the website where you saw it?
Only if they are exceptionally dirty, have skin conditions, or to help with introductions of new cage mates.
Rats often engage in "allogrooming," where they clean each other to strengthen social bonds and reach difficult spots. 🚿 Guidelines for Pet Owners
Use shallow, lukewarm water and unscented, pet-safe soap.
A famous 2018 video appeared to show a rat standing on its hind legs and "soaping" itself like a human.
They typically start by licking their paws to wash their face and ears , then move to their shoulders, flanks, and tail.
If you are a pet owner looking for a "how-to" on washing a rat, experts generally advise against frequent baths unless necessary.
Experts from the University of Helsinki clarified that the animal was actually a Pacarana , a larger South American rodent.