Mammals of Ocean City & Assateague

14 starter mammals curated for visitors—not the full full Assateague mammal list. Likelihood stars rate how often a typical visitor might notice the mammal around OC / Assateague MD (1 rare · 5 common). Always respect horse viewing rules (40+ ft) and marine-mammal distance laws.

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Assateague Horse Equus caballus · Hoofed mammal · ★★★★★ Assateague’s famous feral horses. Maryland’s free-roaming herd is the mammal most visitors come to see. Common Bottlenose Dolphin Tursiops truncatus · Marine mammal · ★★★★★ The everyday marine mammal off Ocean City. Pods surf the breakers and cruise the Inlet all warm season. Eastern Cottontail Sylvilagus floridanus · Other · ★★★★☆ Common rabbit of dune edges, shrub, and park lawns, a twilight feeder across Assateague and mainland yards. Raccoon Procyon lotor · Carnivore · ★★★★☆ Nighttime scavenger of marsh, forest, and beach wrack, and a legendary campground bandit on Assateague. Sika Deer Cervus nippon · Hoofed mammal · ★★★★☆ Small non-native elk introduced to Assateague in the 1920s, often spotted along marsh and forest edges. White-tailed Deer Odocoileus virginianus · Hoofed mammal · ★★★★☆ Native deer of Assateague’s interior forests and shrub, often at dawn and dusk along park roads. Little Brown Bat Myotis lucifugus · Bat · ★★★☆☆ Evening insect hawk over marsh and campground lights, one of several bat species using the Assateague–OC coast. Meadow Vole Microtus pennsylvanicus · Rodent · ★★★☆☆ Tiny grassland rodent of Assateague, more often evidenced by runways in grass than seen in the open. Muskrat Ondatra zibethicus · Rodent · ★★★☆☆ Wetland rodent of Assateague marshes. Look for V-wakes in ditches and push-up houses of vegetation. Red Fox Vulpes vulpes · Carnivore · ★★★☆☆ Dune and forest hunter. NPS notes red foxes denning in sand dunes and roaming for mice, birds, insects, and berries. Virginia Opossum Didelphis virginiana · Marsupial · ★★★☆☆ North America’s only marsupial. NPS highlights opossums as nighttime scavengers that clean up carrion on Assateague. Harbor Seal Phoca vitulina · Marine mammal · ★★☆☆☆ Seasonal pinniped. Most Ocean City / Assateague seal reports come in cold months when seals haul out or cruise nearshore. Humpback Whale Megaptera novaeangliae · Marine mammal · ★★☆☆☆ Occasional offshore giant. Assateague and Ocean City beaches can produce distant blows and breaches on migration. North American River Otter Lontra canadensis · Carnivore · ★★☆☆☆ Sleek marsh and creek hunter, uncommon but present in Assateague’s wetland mosaic.