The marine creature known for its bioluminescence is the jellyfish. Certain species emit a natural light through biochemical reactions within their bodies, primarily using a protein called luciferin. This phenomenon serves various purposes, including attracting prey, deterring predators, and communication among species. The most well-known bioluminescent jellyfish is the Aequorea victoria, which glows a bright blue-green and has contributed to scientific research, particularly in studies involving its green fluorescent protein (GFP). This unique trait not only captivates marine enthusiasts but also plays a crucial role in oceanic ecosystems.