- Hedgehogs are small, insect-eating mammals that are covered in sharp spines.
- Porcupines are large, rodent-like animals that have long, sharp quills.
- Echidnas are small, egg-laying mammals that are covered in sharp spines.
- Armadillos are large, armored mammals that have bony plates that cover their bodies.
- Spiny lobsters are large, marine crustaceans that have sharp spines on their bodies.
- Lionfish are colorful, venomous fish that have long, sharp spines on their fins.
- Scorpions are arachnids that have a long, venomous stinger on their tail.
- Sea urchins are small, spherical echinoderms that have long, sharp spines.