Degus (Octodon degus)! Half-pound, strictly herbivorous fluffballs from South America!
Thanks to them being adorable, sweet-tempered, and diurnal, these guys are actually popular enough in the pet trade that you could have one if you wanted. The degu is a close relative of the chinchilla, viscacha, and guinea pig, in case you couldn’t tell that by looking at it. They also do that adorable dust-bath thing, so there you go.

They are highly social, like, to the point of building communal nests and nursing each other’s babies. The altruism is strong with these ones. They live in burrows, which they cooperate to dig, and forage in packs because there’s way less chance of something eating you that way. They’re also very talky, as you typically see in highly social group-eaters.
Babies are born pretty much good to go, and the males are active participants in raising them. They pee on things to mark their territory, with the additional oddity that they have ridiculously good eyesight for a rodent, including into ranges that humans can’t see, which dovetails nicely with their little tummies and their urine reflecting UV like whoa. Given their recorded tool use and puzzle-solving abilities, this is probably an excellent indication that they have tiny rodent raves when humans aren’t around.

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