The red-crested tree rat hadn't been seen by scientists for more than a century — until this May. The guinea pig-sized creature, with a fiery-red patch of fur on its head and a long, fuzzy black ...

A red-crested tree rat, a rodent about the size of a guinea pig, has been sighted for the first time in decades. The relatively unknown creature made a casual reappearance in a Colombian nature ...

Described as about the size of a guinea pig, the red-crested tree rat—or if that’s not long enough for you: the red crested soft-furred spiny-rat—had only been known from two skins previously.