Definition
A sea urchin is a spiny, globular marine animal belonging to the class Echinoidea. They are known for their protective spines, which can be sharp and even venomous in some species. Imagine a living pincushion rolling along the seafloor! 🐡 Sea urchins are typically found on rocky or sandy bottoms, where they graze on algae and other organic matter. They play a vital role in maintaining the balance of marine ecosystems. They move using tube feet, small, flexible appendages that help them grip surfaces and move slowly. They are also considered a delicacy in some cultures, with their gonads (roe) being a prized food.