Beetles are fascinating insects that belong to the order Coleoptera. They are known for their hard outer shells, called elytra, which protect their delicate wings and bodies. With over 350,000 species, beetles come in various shapes, sizes, and colors, making them one of the most diverse groups of animals on Earth. Some common types include ladybugs, fireflies, and weevils. These insects play important roles in the ecosystem. Many beetles help decompose dead plants and animals, returning nutrients to the soil. Others, like the Japanese beetle, can be pests, damaging crops and gardens. Overall, beetles are essential for maintaining a healthy environment.