Ghost shrimp are appropriately named because they are totally transparent. Despite their shrimp-like appearance, they are actually more closely related to crabs. Four distinct species of Ghost shrimp have been identified as inhabiting the waters of the Gulf of Mexico. Found at water’s edge, they burrow down in seafloor sediments, collecting bits of food. Though they are small, reaching up to three to four inches, Ghost shrimp can dig burrows that can be four feet deep. They are an important part of intertidal ecosystems, because they drive oxygen into the sand as they burrow, which helps organic matter to decompose, enriching the sediment, and ultimately providing food for more creatures.