Porcupines are covered in thousands of quills, modified hairs that detach and lodge in predators, with backward-facing barbs that make them painful to remove.
But they're not aggressive. They'd much rather climb a tree and eat bark, leaves, and twigs in peace.
They're mostly solitary, though mothers care for their young for months, and in winter several porcupines may den together for warmth.
They're surprisingly vocal, with grunts, whines, and chattering sounds. They waddle more than walk, slow and deliberate, trusting their defenses.
You don't need to be fast or social to survive. Defense is not aggression. You can be prickly and still need warmth.
Boundaries are not aggression. They are your safety.
Stay wild,
Chris