The word paludarium comes from the Latin word ‘palus’ meaning marsh or swamp and ‘–arium’ meaning enclosed container. How many species did you find in the Paludarium in the museum lobby? Did you see the big angelfish? Were you lucky enough to catch a glimpse of a crab hiding in the moss on the rocks? The Paludarium is a living ecosystem where all of the living elements (mosses, plants, crabs, and fish) and non-living elements (the water, air, and rocks) interact with one another and are linked through nutrient cycles and energy flows. The balance of the ecosystem is supported each day with just a little food for the fish.