Lake Superior is home to a remarkable variety of wildlife, both beneath its cold freshwater and across the forests, wetlands, islands, and shorelines surrounding the lake. Its enormous size and range of habitats create conditions for wildlife that is adapted to some of the coldest and most remote environments in the Great Lakes region.
But what creatures actually live in and around Lake Superior? The answer includes far more than the fish found in its deep waters. From large mammals and birds along the shoreline to amphibians, reptiles, and tiny aquatic invertebrates, Lake Superior supports a diverse wildlife community shaped by its cold water, northern climate, and varied habitats.
This guide looks at the major groups of Lake Superior wildlife and the habitats where they are found, including some of the species most closely associated with the lake.
Table of Contents
Quick Reference: Wildlife of Lake Superior
| Wildlife Group | Representative Species | Main Habitat | Ecological Role |
|---|---|---|---|
| Fish | Lake trout, lake whitefish, cisco, lake sturgeon | Lake Superior waters, tributaries | Predators, prey, and key parts of the aquatic food web |
| Mammals | Moose, black bear, gray wolf, white-tailed deer | Forests, wetlands, islands, shorelines | Herbivores, predators, and scavengers |
| Aquatic Mammals | Beaver, river otter | Rivers, ponds, wetlands, shorelines | Shape aquatic habitats and feed on aquatic organisms |
| Birds | Bald eagle, common loon, great blue heron, osprey | Open water, wetlands, forests, shorelines | Fish predators, wetland feeders, and migratory species |
| Amphibians | Frogs, toads, salamanders, mudpuppies | Wetlands, ponds, streams, moist forests | Insect predators and prey for larger animals |
| Reptiles | Western painted turtle, snapping turtle, garter snakes | Ponds, wetlands, forests, shorelines | Aquatic and terrestrial predators and omnivores |
| Invertebrates | Freshwater mussels, crayfish, aquatic insects, Hydra | Lake bottom, streams, wetlands, shallow water | Decomposers, filter feeders, and food for fish and birds |
Fish Species in Lake Superior
Lake Superior supports a diverse fish community adapted to its cold, deep, and relatively nutrient-poor water. More than 80 fish species have been recorded in the lake over time, including native species that have lived in the Great Lakes for thousands of years as well as fish introduced through stocking or accidental introductions. Recent U.S. Geological Survey surveys continue to find a fish community dominated by native species, with lake trout, lake whitefish, cisco, and other cold-water fish playing important roles in the ecosystem.
Native Fish Species
Native fish are an important part of Lake Superior’s food web. Lake trout are among the most important native predators, with different forms occupying both nearshore and deep offshore habitats. Lake whitefish and cisco are important prey and forage fish, while lake sturgeon, brook trout, walleye, northern pike, burbot, and several other species also occur in the lake and its tributaries. USGS surveys have found that native fish continue to make up most of the fish community by both numbers and biomass.
Lake trout are particularly significant because their populations were severely affected by overfishing and sea lamprey predation during the 20th century. Long-term rehabilitation efforts have helped restore them, and USGS research now identifies lake trout as a major predator in Lake Superior’s modern fish community. Lake sturgeon and brook trout are also among the native species that have received continued attention as part of fish rehabilitation efforts.
Other native fish include longnose sucker, round whitefish, burbot, northern pike, muskellunge, pumpkinseed, rock bass, yellow perch, and several species of cisco and sculpin. Their habitats vary from shallow coastal waters and river mouths to the deep offshore basin. This range of habitats allows Lake Superior to support fish with very different feeding strategies and life cycles.
Introduced Fish Species
Lake Superior also contains fish that were introduced intentionally or arrived through other pathways. Chinook salmon, coho salmon, rainbow trout, brown trout, pink salmon, and rainbow smelt are among the non-native fish that have become established in the Great Lakes, while sea lamprey is one of the most important invasive species affecting Lake Superior fish. Some introduced salmonids support popular recreational fisheries, while sea lampreys are controlled because they prey on native fish, particularly lake trout.
Sea lampreys entered Lake Superior in the early 1940s and caused severe losses among lake trout and other fish before large-scale control programs were developed. Control efforts remain an important part of Lake Superior fisheries management. At the same time, introduced salmon such as Chinook and coho have established self-sustaining populations and remain part of the modern fish community.
The balance between native and introduced fish has changed over time, but native species still dominate Lake Superior’s fish community. Recent USGS research found that native fish accounted for the large majority of fish numbers and biomass in its 2022 survey, showing the importance of native species to the lake’s present-day ecosystem.
Mammals Around Lake Superior
The forests, wetlands, islands, and shoreline habitats around Lake Superior support a wide range of mammals. Some of the most recognizable are moose, black bears, gray wolves, white-tailed deer, beavers, lynx, red foxes, and porcupines. Their habitats vary considerably, from boreal forests and wetlands to river corridors, rocky shorelines, and remote islands. The mainland around Lake Superior supports more than twice as many mammal species as isolated Isle Royale, where the lake acts as a natural barrier to dispersal.
Moose are among the largest and most distinctive mammals associated with Lake Superior. They are well adapted to the northern forests and wetlands around the lake, and their long legs allow them to move through deep snow and shallow water. During summer, moose often spend time in lakes, ponds, and wetlands feeding on aquatic vegetation and seeking relief from heat. On Isle Royale, they are frequently found near inland lakes, beaver ponds, bogs, and shaded forests, particularly around dawn and dusk.
Black bears occupy the heavily forested areas around Lake Superior, where they search for berries, insects, nuts, and other foods. They are generally most active around dawn, dusk, and nighttime, although sightings can occur during the day. Bears are not naturally found on Isle Royale today, despite the island having suitable habitat, because reaching the isolated island requires crossing Lake Superior.
Gray wolves are especially associated with Isle Royale National Park, where they have been part of a long-running predator-prey study with moose. Wolves generally hunt in packs and can take smaller animals such as beavers and snowshoe hares, but moose are their most important large prey on the island. Researchers have continuously studied the relationship between wolves, moose, and vegetation on Isle Royale since 1958, making it one of the world’s longest-running predator-prey studies.
White-tailed deer are widespread across the mainland forests and shoreline regions surrounding Lake Superior. They use forests, open areas, wetlands, and roadside habitats and feed on grasses, leaves, herbs, and other vegetation. Their presence also makes them an important prey species for large predators such as wolves.
Beavers are closely tied to the region’s waterways. They build dams and lodges along streams, rivers, ponds, and lakes, creating wetlands that provide habitat for other species. On Isle Royale, NPS describes beavers as important aquatic habitat builders, and they can be found along inland waterways as well as portions of the Lake Superior shoreline.
Other mammals add to the diversity of the Lake Superior region. Canada lynx are elusive forest predators adapted to snowy northern environments, while red foxes are more adaptable and can occupy forests, wetlands, and areas closer to human activity. Porcupines are usually associated with mature forests and rocky areas, where they feed on bark, leaves, and other plant material. River otters, snowshoe hares, red squirrels, and other small mammals are also part of the broader wildlife community around the lake.
Woodland caribou deserve special mention because they have a much more restricted distribution around Lake Superior than species such as deer or beaver. They are adapted to the boreal environment and can survive cold winters with their thick coats and broad hooves. Populations occur in parts of northern Ontario associated with the Lake Superior region, although their range is much more limited than it once was.
The variety of mammals around Lake Superior reflects the region’s mix of habitats. Moose depend heavily on wetlands and boreal forests, beavers shape aquatic environments, predators such as wolves and lynx depend on healthy prey populations, and smaller mammals occupy everything from dense woodland to shoreline habitats. Together, these animals form an important part of the larger Lake Superior ecosystem.
Birds Around Lake Superior
The shores and waters of Lake Superior provide important habitat for a wide variety of birds. Forests, wetlands, rocky islands, river mouths, beaches, and shallow coastal waters give birds different places to feed, nest, and rest during migration. Some species are closely tied to the lake itself, while others use the surrounding forests and wetlands. Bald eagles, common loons, great blue herons, gulls, mergansers, and many other waterfowl are among the birds commonly associated with the Lake Superior region.
Bald eagles are one of the most recognizable birds around Lake Superior. They are strongly associated with large bodies of water because fish make up much of their diet. Along the Lake Superior shoreline, they can often be seen soaring over the water, perching in tall trees, or searching for fish near rivers and coastal areas. Pictured Rocks National Lakeshore, for example, has several nesting pairs and considers the bald eagle a fairly common year-round resident.
Common loons are another characteristic bird of the northern Great Lakes. Their distinctive calls are closely associated with quiet freshwater lakes and remote shorelines. Loons are excellent divers and use their strong, webbed feet to pursue fish underwater. Their bodies are unusually dense compared with most birds, helping them dive efficiently, although this makes walking on land awkward.
Great blue herons are commonly associated with the shallow waters, wetlands, rivers, and streams around Lake Superior. They usually hunt by standing still in shallow water and watching for fish and other small animals before striking with their long bills. They may also feed away from the water in fields and other open areas. Great blue herons are the largest herons in North America and can reach about 4 feet in height with a wingspan of roughly 5½ to 6½ feet.
Lake Superior also attracts many gulls, mergansers, ducks, and other waterfowl. Mergansers are particularly well suited to the lake because they are diving ducks that pursue fish underwater. Other waterfowl use sheltered bays, wetlands, rivers, and smaller inland lakes along the shoreline. During migration, the Lake Superior region can become an important stopping area for birds moving between northern breeding grounds and areas farther south.
The lake’s forests and cliffs also provide habitat for birds that do not depend directly on open water. Raptors such as osprey, peregrine falcons, northern goshawks, and other hawks can be found in parts of the Lake Superior region. At Pictured Rocks, for example, peregrine falcons have successfully nested following their reintroduction, while merlins use the forests and open areas along the shoreline.
Together, these birds show how closely Lake Superior’s wildlife is connected to both land and water. Fish-rich waters support bald eagles and loons, shallow wetlands provide feeding grounds for herons and waterfowl, and the surrounding forests and cliffs give raptors and other birds places to nest and hunt. This variety makes the Lake Superior shoreline an important habitat for resident and migratory birds throughout the year.
Amphibians and Reptiles Around Lake Superior
Amphibians and reptiles are less numerous around Lake Superior than mammals, birds, and fish, partly because of the region’s cold northern climate and long winters. Even so, wetlands, ponds, slow-moving streams, inland lakes, forests, and shoreline habitats provide suitable environments for several species. Among the reptiles found in the Lake Superior region are western painted turtles, eastern snapping turtles, and several species of snakes, while frogs, toads, and salamanders represent the amphibians.
The western painted turtle is one of the better-known turtles around Lake Superior. It is commonly associated with ponds, inland lakes, marshes, and slow-moving streams where it can find aquatic vegetation and places to bask. During warm weather, painted turtles often climb onto partially submerged logs or rocks to absorb heat from the sun. They spend winter in the bottom mud of water bodies, where their metabolism slows considerably.
The eastern snapping turtle is another large aquatic turtle found in parts of the Lake Superior region. It prefers shallow lakes, ponds, marshes, and slow-moving rivers with soft bottoms and abundant vegetation. At Pictured Rocks National Lakeshore, NPS notes that snapping turtles can occasionally be seen in or near Lake Superior, although they are more commonly associated with inland wetlands and other protected waters. They can become quite large, with some individuals weighing around 30 pounds or more.
Several snake species also occur along the Lake Superior shoreline and in nearby forests and wetlands. Eastern garter snakes are among the more commonly encountered species, while northern red-bellied snakes and smooth green snakes have also been documented at Pictured Rocks. Encounters are generally uncommon, and these snakes tend to remain in vegetation, forest habitats, or areas near wetlands.
The surrounding wetlands also support frogs, toads, and salamanders. These amphibians are closely tied to moist environments because many depend on ponds, streams, wetlands, or damp forests during parts of their life cycle. They also play an important role in the food web by feeding on insects and other invertebrates while serving as prey for fish, birds, reptiles, and mammals.
Lake Superior’s amphibians and reptiles are more closely associated with its shoreline, wetlands, rivers, and inland waters than with the deep open lake itself. Their presence adds another layer to the region’s wildlife diversity, particularly in the quieter habitats where shallow water, vegetation, and forest provide the conditions these animals need.
Aquatic Invertebrates in Lake Superior
Lake Superior may be best known for its fish, but its aquatic ecosystem also supports a wide variety of invertebrates. These aquatic invertebrates live in the lake, along its shallow edges, and in streams and wetlands that flow into it. They include freshwater mussels, crayfish, aquatic insects, snails, worms, small crustaceans, and tiny organisms such as Hydra. Although many are easy to overlook, they are an important part of the food web and provide food for fish, birds, and other wildlife.
Freshwater mussels are among the larger invertebrates found in the Lake Superior region. They live on or in the bottom sediments and filter material from the water as they feed. Their presence also reflects the close connection between Lake Superior and its tributaries, since many freshwater mussel species depend on rivers and streams during parts of their life cycles. Several species of mussels and other bivalves have been documented in aquatic habitats around Lake Superior.
Crayfish are another familiar aquatic invertebrate. Native crayfish occur in waters connected with Lake Superior, where they live among rocks, vegetation, and other underwater cover. They feed on a mixture of plant and animal material and can themselves become prey for fish, birds, and mammals. Their role in the food web makes them an important link between smaller aquatic organisms and larger animals.
The lake and its tributaries also support numerous aquatic insects. Larvae of stoneflies, caddisflies, dragonflies, and damselflies spend part of their lives in water before emerging as adults. These insects are particularly important in streams flowing into Lake Superior, where their presence can provide clues about water quality. Caddisfly and stonefly larvae, for example, are often associated with clean, well-oxygenated water.
Some of the smallest creatures in Lake Superior are also among the most interesting. Hydra, tiny freshwater relatives of jellyfish, attach themselves to underwater surfaces and capture very small prey. The lake and surrounding aquatic habitats also contain zooplankton and other microscopic organisms that form an important base of the food web. At Pictured Rocks, NPS has documented Hydra, freshwater sponges, small crustaceans, aquatic worms, snails, and other invertebrates in aquatic environments.
These small animals may not attract the same attention as a moose, bald eagle, or lake trout, but they are essential to Lake Superior’s ecosystem. Invertebrates help process organic material, provide food for fish and other wildlife, and contribute to the movement of energy through the food web. Their diversity shows that Lake Superior wildlife extends well beyond the larger animals that are easiest for visitors to see.
Conclusion
Lake Superior supports a remarkable variety of wildlife both in its cold freshwater and across the forests, wetlands, islands, and shorelines surrounding the lake. Its waters are home to native fish such as lake trout, lake whitefish, and lake sturgeon, along with introduced species and a wide range of smaller aquatic organisms. The surrounding habitats support mammals, birds, amphibians, and reptiles adapted to the region’s long winters and northern climate.
Moose, black bears, wolves, beavers, deer, lynx, and other mammals are part of the terrestrial wildlife community, while bald eagles, loons, herons, and waterfowl make use of the lake and its shoreline habitats. Remote areas such as Isle Royale show how isolation can shape wildlife communities, with only about 18 mammal species found there compared with more than 40 on the surrounding mainland.
What makes Lake Superior wildlife especially diverse is the close connection between water and land. Fish support birds and larger predators, wetlands provide habitat for amphibians and mammals, and forests offer shelter and food for animals ranging from moose to foxes. Together, these habitats form a large interconnected ecosystem that extends far beyond the lake’s open water.
From a lake trout in the deep water to a bald eagle along the shoreline or a moose moving through a northern wetland, the wildlife of Lake Superior shows how closely the lake’s waters and surrounding landscapes are connected.