Madeleine Hull
Penguins are carnivores with a piscivorous diet consisting of fish, crustaceans, and cephalopods. They eat a lot of krill, a shrimp-like crustacean, as well as squid and cuttlefish. Fish makes up around 80% of their diet, with lanternfish being the preferred catch, especially during the breeding season. In winter, squid forms a larger part of their diet. Penguins are flightless birds that hunt by swimming in icy Antarctic waters, so it's not surprising that fish and other marine life are their primary source of nutrition.
| Characteristics | Values |
|---|---|
| Diet | Fish, crustaceans (especially krill), squid, and cephalopods like cuttlefish |
| Diet Variation by Species | Smaller Antarctic and subantarctic penguins eat more krill and squid; species farther north eat more fish; Adélie penguins eat small fish, krill, and squid; Chinstrap penguins eat large krill; Emperor penguins eat Antarctic silverfish, lanternfish, icefish, and small crustaceans; King penguins eat fish, squid, and crustaceans |
| Diet Variation by Season | Squid forms a more important part of the penguin diet in the winter |
| Diet Variation by Breeding Status | Breeding male king penguins fast for up to 54 days during courtship and the first incubation shift; male emperor penguins fast and live off reserves of body fat, losing up to 45% of their body weight |
| Diet Variation by Hunting Location | Hunting areas may range from 15 km (9 mi) for Adélie penguins to nearly 900 km (559 mi) for king penguins |
| Diet Variation by Depth | Most feeding occurs within 50 to 60 feet of the surface; some species, like the yellow-eyed penguin, dive as deep as 395 feet |
| Dietary Challenges | Commercial fishing activities, climate change, and fluctuating fish stocks impact the availability of marine life that penguins rely on |
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What You'll Learn
Fish, especially lanternfish
Fish is a major part of a penguin's diet, with fish forming around 80% of their food. Lanternfish are the preferred catch, especially during the breeding season. Lanternfish are small mesopelagic fish of the large family Myctophidae, found in oceans worldwide. They are generally small fish, ranging from about 2 to 30 cm in length, with most being under 15 cm. They have a slender, compressed body covered in small, silvery deciduous cycloid scales, a large bluntly rounded head, large elliptical to round lateral eyes, and a large terminal mouth with jaws closely set with rows of small teeth. The fins are generally small, with a single high dorsal fin, a forked caudal fin, and an adipose fin. Most lanternfish have a gas bladder, which they use to regulate their buoyancy when they make a nightly journey to the ocean surface in search of their favourite snack, zooplankton. They return to the depths by sunrise.
Lanternfish are well-equipped for life in the ocean twilight zone, with glowing blue-green lights embedded all over their bodies. These lights are special light-producing organs called photophores, which line the belly of the fish and help them blend in with light-speckled waters and confuse predators that might attack from below. The arrangement and flashing pattern of these lights are unique to each of the 245+ species of lanternfish, and are thought to be used for communication as well as camouflage. Lanternfish are among the most widely distributed, diverse, and populous vertebrates, with a total global biomass of 1.8 to 16 gigatonnes, accounting for up to 65% of all deep-sea fish biomass. They are an important link in the food chain of many local ecosystems, being heavily preyed upon not only by penguins, but also by whales and dolphins, large pelagic fish, grenadiers, other deep-sea fish, pinnipeds, sea birds, and large squid.
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Crustaceans, especially krill
Krill is an essential part of the diet for these smaller penguin species as they are unable to compete with larger species for fish. The availability of krill is also influenced by environmental factors such as sea ice cover. A decline in sea ice cover in the Antarctic has led to a decrease in krill populations, impacting the food sources available to penguins.
Penguins have developed strategies to aid in the digestion of crustaceans, such as swallowing stones to help break down the tough exoskeletons of krill. This behaviour has been observed in rockhopper and macaroni penguins, who ingest stones ranging from 10 to 30 mm in diameter.
In addition to krill, penguins also consume other types of crustaceans. Emperor penguins, for example, include small crustaceans in their diet, which they obtain by diving deep into the ocean. Gentoo penguins, another deep-diving species, also feed on small crustaceans in addition to their preferred prey, squid.
While fish is the primary component of most penguin diets, crustaceans, especially krill, play a vital role in the nutrition of many penguin species, particularly those adapted to foraging for this abundant food source in the icy waters of the Antarctic and subantarctic regions.
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Cephalopods, like squid and cuttlefish
The smaller penguin species of the Antarctic and subantarctic regions primarily feed on squid and krill. Species found farther north tend to eat more fish. During the winter, squid forms a more important part of penguins' diets.
Penguins are carnivorous birds, and their diet consists mostly of fish and other aquatic animals. They are well adapted to life in frozen landscapes, swimming through subzero-temperature waters in pursuit of food. As flightless birds, they hunt by swimming in the icy Antarctic waters, and their survival depends on the availability of marine life.
The specific diet of penguins varies depending on their species and geographical location. Emperor Penguins, for example, mainly eat Antarctic silverfish, lanternfish, and icefish, while also consuming small crustaceans and krill. Adélie and Chinstrap Penguins are shallow-diving species that forage offshore, and their diet primarily consists of krill.
The hunting techniques of different penguin species also vary, with some engaging in deep diving, group hunting, or surface feeding to capture their prey. Human activities, such as overfishing and climate change, have impacted the availability of their primary food sources, forcing penguins to travel further for food.
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Stones, to aid digestion
Penguins are carnivores with a piscivorous diet consisting of fish, crustaceans, and cephalopods. Fish make up around 80% of their diet, with lanternfish being the preferred catch, especially during the breeding season. In winter, squid forms a larger part of their diet.
Smaller penguin species in the Antarctic and subantarctic regions primarily feed on krill and squid, while species found farther north tend to eat more fish. For example, Adélie penguins feed mainly on small krill, while chinstraps hunt for larger krill. Emperor penguins eat mostly fish and squid, while king penguins' diets consist of around 80% fish, such as cod and sardines.
Penguins also eat crabs and barnacles. They have been observed participating in multispecies feedings with other seabirds, such as brown pelicans and magnificent frigatebirds.
Penguins are flightless birds that hunt by swimming in icy Antarctic waters. They have great eyesight and can change the shape of their eye lens to see more clearly underwater. They do not stop swimming while hunting and snatch prey between their bills, swallowing it whole.
As part of their feeding behaviour, penguins swallow stones, which may serve several purposes. One theory suggests that the stones reduce buoyancy while diving or alleviate hunger. Another suggests that the rocks aid in digestion by helping to break down the tough exoskeletons of crustaceans, such as krill, in the stomach. Rockhopper and macaroni chicks have been observed swallowing stones, and king penguins have been seen to actively seek out and swallow stones measuring 10-30mm in diameter.
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Crabs and barnacles
Penguins are known to consume a variety of crustaceans, with krill being the most popular. Krill are small shrimp-like crustaceans that can be found in all oceans worldwide, and they form a significant part of the diet of smaller Antarctic penguin species like Chinstrap and Adelie Penguins. Larger penguin species, such as King and Emperor Penguins, also consume krill as part of a more diverse diet that includes squid and small fish.
In addition to krill, penguins also eat other crustaceans such as amphipods, which resemble shrimp but lack a hard covering over the thorax. These tiny creatures provide food for penguins and other marine life, inhabiting nearly all aquatic habitats.
While crabs may not be a staple in their diet, penguins do consume certain types of crustaceans that have hard exoskeletons. Rockhopper and macaroni penguins, for example, swallow stones to aid in the digestion of these tough-exoskeleton crustaceans.
Barnacles, on the other hand, do not seem to be a part of a penguin's diet according to the sources. While penguins are known to feed on a variety of marine life, barnacles are not mentioned as a food source in any of the sources consulted.
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Frequently asked questions
A penguin's diet mostly consists of fish, crustaceans (especially krill) and squid.
Yes, penguins also eat cephalopods such as cuttlefish. They also swallow stones to reduce buoyancy while diving or to aid in digestion.
Yes, different species of penguins have different diets. For example, the Adélie penguin's diet primarily consists of small krill, while the Chinstrap penguin forages for large krill. The Emperor penguin's diet mainly consists of fish, such as Antarctic silverfish, lanternfish and icefish.
