Walrus Diet: What Do They Eat And Why?

The diet of a walrus is a varied one. Walruses are known to eat a wide range of invertebrates, including crustaceans, octopuses, and clams. They also feed on fish carcasses and some seal species when food is scarce. They have been observed to eat up to 6,000 clams in a single feeding session. Walruses are also known to prey on seabirds, particularly the Brünnich's guillemot, and even other pinnipeds like narwhals. They have also been known to scavenge on whale carcasses.

Clams, oysters, and other bivalve molluscs

Clams are a favourite food of walruses. They also eat oysters and other bivalve molluscs. Walruses are massive carnivores and their diet consists of more than 60 genera of marine organisms. They are known to eat crustaceans, octopuses, and other small invertebrates such as snails, molluscs, sea cucumbers, and crabs. They also feed on fish carcasses and some seal species when food is scarce.

Walruses obtain their food (benthic invertebrates) by sweeping the bottom of the ocean. They can dive to depths of about 90 m to forage, using their vibrissae to sweep through ocean sediments to detect their prey. They move their snouts along the bottom, rooting through the sediment and using their vibrissae to help detect prey. Abrasion patterns of the tusks show that they are dragged through the sediment, but are not used to dig up prey.

Walruses do not chew their food, but they do sometimes crush clam shells. They suck off the foot and the fleshy siphon of a clam and swallow it whole. The cheek teeth do get worn, but this is probably from abrasion by minute particles of sand that walruses inadvertently take into their mouths and not from crushing clam shells. Researchers have found numerous pebbles and small stones in the stomachs of walruses.

Walruses eat a lot of clams. Each time a walrus dives to the ocean floor, it can forage and eat about 60 clams. Adult walruses have been studied to eat 3,000 to 6,000 clams in one feeding session. They fill their stomachs twice a day, eating about 3-6% of their body weight per day.

In captivity, oysters comprise an insignificant portion of a walrus's diet. However, Lewis Carroll's poem "The Walrus and the Carpenter" portrays the biological walrus's appetite for bivalve molluscs, oysters, primarily nearshore and intertidal inhabitants.

Crustaceans and other invertebrates

Walruses have a varied diet, feeding on more than 60 genera of marine organisms. They are known to eat crustaceans and other invertebrates, including clams, oysters, mussels, octopuses, sea cucumbers, and worms. They also eat some fish, seabirds, and seals.

Walruses obtain their food by sweeping the bottom of the ocean, dragging themselves along the ocean floor in search of prey. They use their vibrissae (or whiskers) to detect food in the ocean's murky waters. They also use their flippers to uncover prey from the sediment, and they may squirt powerful jets of water to excavate burrowing invertebrates.

Clams are a particular favourite of walruses, and they can eat up to 6,000 clams in a single feeding session. They suck the meat out of clams by sealing their powerful lips to the shell and withdrawing their piston-like tongue rapidly into their mouth, creating a vacuum. Walruses do not chew their food, but they sometimes crush clam shells. They also eat other types of molluscs, including snails, oysters, and octopuses.

In addition to clams and other molluscs, walruses also eat a variety of small invertebrates, such as sea cucumbers, worms, and crustaceans. They need to eat a lot of these small animals to sustain their massive weight, which can be up to 2 tons for males and 1,873 pounds for females. Walruses spend most of their time looking for food, and they eat about 3-6% of their body weight per day.

The diet of walruses can vary depending on the time of year and the location. For example, walruses in Bristol Bay, Alaska, have been found to have diverse diets with some variation in composition related to the time of year and the distribution of prey.

Seals and other marine mammals

Walruses are large, semi-aquatic marine mammals that can be found in the Arctic Ocean and subarctic seas of the Northern Hemisphere. They are easily recognisable due to their prominent tusks and whiskers, as well as their considerable bulk. An adult male walrus in the Pacific can weigh more than 2,000 kilograms (4,400 pounds), making it one of the largest pinnipeds.

Walruses have a diverse and opportunistic diet, feeding on more than 60 genera of marine organisms. They are known to eat various types of small invertebrates, including snails, molluscs, sea cucumbers, crabs, shrimp, and worms. They also feed on some fish carcasses and have been known to scavenge on whale carcasses. Walruses are also known to eat seabirds, particularly the Brünnich's guillemot (Uria lomvia).

However, the main component of a walrus's diet is benthic bivalve molluscs, especially clams. Walruses forage for clams by grazing along the sea bottom, using their sensitive vibrissae (whiskers) to search for and identify their prey. They also use their vibrissae to stir up the sediment and uncover prey. Walruses may also take in mouthfuls of water and squirt powerful jets of water at the sea floor to excavate burrowing invertebrates like clams.

While it is not their primary source of food, walruses do sometimes eat seals. This is more likely to occur when food is scarce, and it is usually male walruses that do so. These males are larger and more powerful than other males and have been observed feeding on ringed and bearded seals. They may also prey on ice-trapped narwhals.

Walruses are diurnal, meaning they eat during the day and sleep at night. They fill their stomachs twice a day, consuming about 3-6% of their body weight in food. This can amount to 120 kilograms per day for a male walrus weighing 2000 kilograms.

Cephalopods and other bottom-dwelling organisms

Walruses are known to feed on a variety of marine organisms, including cephalopods and other bottom-dwelling organisms. They are skilled at locating and consuming prey from the ocean floor, using their vibrissae (sensitive whiskers) to navigate and detect their food.

The diet of a walrus consists largely of benthic invertebrates, which they obtain by sweeping the ocean floor. Walruses are particularly fond of clams, and a single adult walrus can eat up to 6,000 clams in one feeding session. They use their powerful lips and piston-like tongues to create a vacuum, sucking the meat out of the clam shells. While they do not chew their food, they sometimes crush the shells with their teeth or by using their strong jaws.

In addition to clams, walruses also consume other types of mollusks, including snails, octopuses, and squid. They are also known to eat sea cucumbers, tube worms, soft corals, tunicates, and even some types of slow-moving fish. Walruses are not picky eaters and will feed on whatever is available, including fish carcasses and seal tissue when food is scarce.

The diet of a walrus can vary depending on the location and time of year. For example, walruses in Bristol Bay, Alaska, have been found to feed on a diverse range of prey, with some variation in their diet depending on the season and the distribution of prey.

Overall, walruses play an important role in the Arctic ecosystem by helping to maintain a balance in the local population of benthic invertebrates. Their feeding habits influence the structure and diversity of the benthic community, highlighting their significance in the food chain as both predators and prey.

Fish and other vertebrates

Walruses are carnivores that rarely chase their prey. They are massive creatures, with adult male walruses in the Pacific weighing more than 2,000 kilograms (4,400 pounds). They have distinctive tusks and whiskers, and considerable bulk. They are excellent swimmers and divers, and they can dive to depths of about 90 metres to forage.

Walruses have a diverse and opportunistic diet, feeding on more than 60 genera of marine organisms. They are particularly fond of clams, and each time they dive, they can eat about 60 of them. In a single feeding session, adult walruses can eat 3,000 to 6,000 clams. They forage for clams by grazing along the sea bottom, searching for and identifying them with their sensitive vibrissae. They then use their powerful lips and piston-like tongues to suck out the meat, creating a vacuum.

Walruses also eat other types of fish and vertebrates. They feed on slow-moving fish, such as herring and capelin, as well as various other types of seafood. This includes shrimp, crabs, priapulids, spoon worms, tube worms, soft corals, tunicates, sea cucumbers, octopuses, and squid. They also eat some types of seabirds, such as the Brünnich's guillemot.

In addition to fish and invertebrates, walruses will also eat the carcasses of seals and other pinnipeds when food is scarce. They have been observed preying on seals up to the size of a 200 kg (440 lb) bearded seal. There are some rare but habitual seal-eating walruses, and these are usually male, larger than other males, with powerful shoulder and chest muscles.

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