The Psammead is a fictional creature from the children's book series "Five Children and It" by E. Nesbit. It resembles a small, furry, and magical creature with large ears and a wise demeanor. The Psammead has the ability to grant wishes, but these wishes often come with unexpected consequences. In the story, a group of siblings discovers the Psammead while playing in the sand. They learn that their wishes last only until sunset, leading to various adventures and lessons about the nature of desire and responsibility. The Psammead's character embodies themes of curiosity and the complexities of wish fulfillment.