Why Porcupine Has Quills

S1, E17: Once Porcupine didn't have quills, she had the softest coat in all of Tinga Tinga and Jackal wanted it. Despite warnings from all the animals Porcupine allowed Jackal to invite her to his cave to keep out of the rain. Porcupine took off her coat to allow it to dry, but while she slept naughty Jackal ran off with it.