The Thin-spined Porcupine lives in the Atlantic Forest of Brazil, spending its daylight hours in hollows. It is primarily nocturnal and feeds on leaves; cecropia tree foliage is a favorite. It faces various predators, including wild cats, large birds of prey, and humans who hunt it for its meat and spines. 

They are primarily brown or grey, boasting bristle-like hairs rather than typical spines. However, the head, neck, and forelimbs feature less pliable spiky hairs. Their feet and tail exhibit a dark brown or black hue.

Moreover, their breeding season is not specific. Female porcupines give birth to one offspring after a gestation period of around 210 days.