Porcupines' quills are described as which?

• A. They have poisonous quills.
• B. They have excellent vision.
• C. They can throw their quills at attackers.
• D. They have poor vision but good sense of smell.

Answer: (D)

Porcupines rely more on scent and hearing than on sharp sight. Their eyes are relatively small, so their distance vision isn’t good, especially in low light. In contrast, their sense of smell is well developed, helping them detect predators, locate food, and navigate their environment. The quills themselves are a defense mechanism, not a weapon that can be thrown or delivered with venom—quills aren’t poisonous and porcupines don’t shoot them. They work by detaching when touched, sticking to a would‑be attacker or becoming a nuisance to anyone handling the animal. So the description that fits best is that porcupines have poor vision but a good sense of smell.