Rotifers are microscopic animals found in freshwater, marine environments, and damp soil. These invertebrates are also known by the scientific name of Bdelloidea and are characterized by the presence of a rotatory wheel-like crown, called a corona, which they use to move and feed. Other synonyms for rotifers include wheel animals, rotiferans, rotatory animals, and wheel bears. These tiny animals play an essential role in the aquatic ecosystem, serving as food for larger fish, insects, and crustaceans. They also contribute to nutrient cycling by consuming and breaking down organic matter. Although they may be small, rotifers have a significant impact on the health and balance of aquatic environments.