Gentoo Penguin

Quick Take

• Gentoo Penguins can literally slow their own heartbeat to a fraction of its normal rate, and the reason why reveals something remarkable about how they hunt. Diving heart-rate control →
• A male Gentoo's best shot at winning a mate comes down to a single rock, and the colony enforces relationship rules more strictly than most humans do. Pebble courtship and monogamy →
• Clumsy on land but record-breaking in water, the Gentoo Penguin holds a speed title that no other bird can touch. Swimming speed record →
• When food runs short, Gentoo parents face a survival decision about their own chicks that's as ruthless as anything in nature. Survival threats and hard choices →

Gentoo Penguins are, much like the other penguin species, dressed for dinner in tuxedo feathers of black coats and starched white chests. They sport a jaunty white stripe from eye to eye across the tops of their heads and flamboyant orange-red beaks — dashing figures against a bleak Antarctic landscape.

Clumsy waddlers on land, Gentoo Penguins are graceful athletes in the water and are the fastest-diving birds, reaching speeds of 22 mph. They are rarely aggressive and mostly keep their cool; however, they are known to get loud and rowdy during their nesting period.

Incredible Facts About Gentoo Penguins

• Gentoo Penguins are the third-largest penguins in the world, after the emperor and king penguins.
• Gentoo Penguins, when diving in deep waters, can control and reduce their heartbeat considerably. Their heart rate can drop from 80–100 heartbeats per minute down to just 20 heartbeats per minute.
• They are the fastest swimming penguins in the world and learn to swim without any help from their parents.
• Gentoo penguins are very relaxed creatures and are rarely ever aggressive.
• They use a variety of materials during their nesting period, ranging from molted feathers to pebbles.
• Males and females mate for life and share parenting duties, including incubating their eggs.

Evolution

Fossil records indicate that all penguins’ common ancestors lived as long as 20 million years ago, and some extinct species stood over two meters tall. They are believed to have originated in Antarctica, which was covered in forests at that time and connected to what would become New Zealand, Australia, South America, and surrounding islands. These ancient ancestors of penguins had diverged from the ancestors of petrels and albatrosses around 71 million years ago.

The arrival of the ice age around 34 million years ago brought brutal changes to the ancient ancestors of the penguin. The continents of Australia and South America drifted away from Antarctica while ocean currents encircled it. This cooling climate likely killed the older penguins, leaving the survivors to compete with whales for the same prey.

While most of the ancient penguins became extinct, others, like the macaroni penguin, swam to warmer waters to establish new lineages. Species like the emperor penguin stayed in Antarctica and evolved adaptations suited to living in the cold environment. The Gentoo penguins ventured as far as subantarctic islands, with some staying on the continent.

Classification and Scientific Name

The scientific name of the Gentoo Penguin, belonging to the genus Pygoscelis, is Pygoscelis papua. Their genus got this name, Pygoscelis, because their prominent tails swish from side to side when they walk. Pygoscelis means ‘rump-legged.’

However, the origin of the word Gentoo remains unclear. Some say the word was used by Anglo-Indians to distinguish Hindus from Muslims. Another theory states that the name might have come from some turban-related term, as the white patch on the penguin’s head resembles a turban.

Species

Gentoo Penguins can further be divided into four subspecies. Before 2021, only two subspecies were recognized, but a 2020 study suggested otherwise. After some debate over whether there were four separate species or subspecies, the International Ornithological Congress determined in 2021 that there are four subspecies of Pygoscelis papua.

• Northern Gentoo Penguin (Pygoscelis papua papua): the larger Gentoo penguins, found in varied habitats including the Falkland Islands, Martillo Island, and Isla de los Estados, Argentina.
• Southern Gentoo Penguin (Pygoscelis papua ellsworth): the smaller Gentoo penguins that live and breed on the coasts of the Antarctic Peninsula, the South Orkney Islands, South Shetland Islands, and South Sandwich Islands.
• Eastern Gentoo Penguin (P.p. taeniata): inhabits the Crozet Islands, Prince Edward Islands, Kerguelen Islands, Heard Island, and Macquarie Island.
• South Georgia Gentoo Penguin (P. p. poncetii): can only be found on South Georgia Island.

Appearance and Behavior

On their back and head, Gentoo Penguins are black, with a white patch on their belly (front). They also have a white stripe that runs from eye to eye at the top of their head. This is referred to as a bonnet or turban and is distinctive to the Gentoo penguin.

Gentoo penguins have pinkish webbed feet and the longest tail among all penguin species. The underside of their flippers matches their feet. Gentoo Penguins are the only penguins with a bright orange bill.

The adults have very distinct eye patches, while the younger ones have relatively dull patches that grow more defined. At birth, baby Gentoos are grey and slowly turn black within a week. Adult Gentoos are usually 28 to 35 inches in height and can weigh up to 18 pounds. Birds from the north average 1.5 pounds heavier than their southern counterparts. All Gentoo penguins — male and female — lose weight while taking care of their babies and can weigh as little as 9.9 pounds during that time.

In terms of behavior, these penguins are usually laid-back and are hardly ever aggressive. They are also known to be shy and usually do not make any effort to mark or defend their territories.

Habitat

Gentoo Penguins can be found in a variety of regions in the Southern Hemisphere. The Antarctic Peninsula and the sub-Antarctic Islands are home to the largest numbers. They are partial to ice-free areas like coastal plains, sheltered valleys, and cliffs. Some gentoos prefer pebbled beaches or twig-laden areas. Breeding settlements are sometimes located near the shoreline but can also be inland. Colonies in South Georgia breed further inland than other Gentoos, where they nest in grassy areas.

Diet

The Gentoo Penguin diet includes fish, squid, as well as crustaceans. Adults spend the entire day hunting, usually close to shore but sometimes miles away. They can remain below water for up to seven minutes and dive as deep as 655 feet.

Gentoo diets are high in salt because they eat animals with about the same salinity as seawater. Like other marine birds, they have developed a salt gland above their eyes that extracts the high concentration of sodium from the body and produces a highly saline solution that drips from the tip of their beaks.

Predators and threats

Usually, leopard seals, orcas, and sea lions are the main creatures that prey on penguins. However, this is true only near or in the water. On land, these penguins have few threats except those from humans. Humans have historically hunted them, and they are threatened by pollution and climate change. Several birds also like to prey on Gentoo penguin chicks, including skuas, giant petrels, kelp gulls, and the snowy sheathbill.

Reproduction, Babies, and Lifespan

Gentoo penguins are monogamous and usually mate for life. Monogamy is so important to them that infidelity is often punished by banishment from the colony. Gentoos fashion nests out of pebbles and are known to be quite particular about them. A male Gentoo can win the favor of a female during courtship by presenting her with a beautiful rock. Nests consist of a circular pile of carefully selected stones and are guarded with the utmost attention. Many fights occur over these prized pebbles during nesting season — a time when the usually laid-back birds bristle with energy and seem aware of the important task they are undertaking.

Two eggs are laid into the perfectly prepared nest. Both parents share incubation duties by taking turns daily. The eggs, the second of which is always smaller than the first,, usually hatch 34 to 37 days after they are laid. Then, active parenting begins as the penguin couple works together to protect and feed their little chicks. Gentoo parents are very protective and nurturing during the month the babies stay in the nest — and afterward, when the chicks graduate to crèches (communal nursery groups within the colony) where they spend their early weeks.

Usually around January, approximately three months after they are born, the chicks start developing their adult feathers and going out on their own. They usually go out to sea at around 80 to 100 days after their birth.

However, sadly, their survival often depends on food availability. If food becomes scarce, the parents may choose to feed the stronger chick while sacrificing the weaker one.

Gentoo Penguins live a total of 15 to 20 years. Surprisingly, the most brutal battle for life is often fought within their first year, with only a 30 to 50 percent chance of surviving to their second year.

Population

Gentoo penguins are listed as Least Concern by the IUCN. According to sources, the breeding population of the Gentoo penguins currently stands at over 380,000 pairs.

In the Zoo

Gentoo Penguins can be kept in zoo environments and adapt well with minimal problems. According to available sources, more than 750 Gentoo Penguins currently live in zoos around the world.