What has a spine but isn’t a cactus?

Riddle Explanation:
The riddle, “What has a spine but isn’t a cactus?”, cleverly refers to a hedgehog. While cacti have spines for protection in deserts, hedgehogs have sharp spines (or quills) on their backs, which they use as a defense mechanism against predators. This riddle plays on the dual meaning of “spine,” making it a fun and thought-provoking puzzle.