Between the ebb and flow of tides, the city’s exposed shoreline is home to a fish that walks on land, the mud crab that clings tenaciously to mangrove tree trunks, the mighty periwinkle, the bubbler crab that spits out sand balls, the long legged egret that fishes, the curlew that stalks fiddler crabs, and the carnivorous marine gastropod mollusks, aka the nudibranchs.