National Crawfish Day is observed every April 17, celebrating one of the most iconic foods of the American South, particularly in Louisiana, where over 90% of the country's crawfish farms are located. The holiday was founded in 2020 by Shell Shack, a Dallas-based seafood restaurant chain, with the aim of introducing more people to the deliciousness of crawfish during its peak season from February to mid-May. Typical customs include hosting crawfish boils, where live crawfish are boiled with seasonings and vegetables, and enjoying various dishes such as crawfish étouffée, crawfish pie, and crawfish beignets. People celebrate by going to seafood restaurants, inviting friends and family for boils, attending crawfish festivals, or sharing recipes on social media. Crawfish, also known as crayfish or mudbugs, are freshwater crustaceans closely related to lobsters, and they play a significant role in the culinary traditions of Louisiana and surrounding states.