Claire Thompson
Emperor penguins are the giants of the penguin world, uniquely adapted to survive the harsh Antarctic conditions. During the breeding cycle, the female emperor penguin lays a single egg and passes it to her mate to incubate. The male emperor penguin balances the egg on his feet for 65-75 days, during which he does not eat. When the chick hatches, it is very small, weighing only 150-200 grams (or 315 grams according to another source) and is covered with a thin layer of down. The male penguin feeds the newly hatched chick a curd-like substance, which is secreted by a gland in his oesophagus.
| Characteristics | Values |
|---|---|
| Weight | 150 g to 200 g or 315 g |
| Height | About 3 feet tall |
| Appearance | Covered with silver-grey down, black heads and white masks |
| Hatching time | 65 to 75 days |
| Parenting | Only male emperor penguins incubate the eggs |
| Feeding | The male feeds the chick a curd-like substance composed of 59% protein and 28% lipid |
| Protection | Chicks form a crèche, huddling together for warmth and protection |
| Threats | Global warming, ocean acidification, and industrial fisheries |
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What You'll Learn
Emperor penguin chicks weigh 150-200 g at hatching
Emperor penguin chicks are tiny when they hatch, weighing only 150 to 200 grams. This is in stark contrast to the adult penguins, which weigh between 22 and 30 kilograms at this time of year. The chicks are covered with only a thin layer of down and are unable to regulate their body temperature. It takes about 50 days for them to develop this ability. During this time, the parents must keep the chicks warm, which they do by covering them with their brood patch. The male emperor penguin has a unique ability to produce a curd-like substance from his oesophagus to feed the chick, even though he has been fasting for up to four months. This substance is composed of 59% protein and 28% lipid and allows the chick to survive and grow for up to two weeks.
The female emperor penguin passes the egg to her mate to incubate, and she spends the next nine weeks at sea feeding. The male carefully balances the egg on his feet for between 65 and 75 days to keep it warm in a specially adapted brood pouch, before it hatches. The emperor is the only penguin species where the male alone incubates; in all other penguin species, both parents take shifts incubating. The male relies entirely on his body fat to survive the long winter fast, and by the time the female returns, he has lost nearly half of his body mass.
The breeding cycle of emperor penguins begins in autumn, around April, when the sea ice reforms and gets thick enough to support the thousands of penguins. The penguins return year after year to the same location. Courtship displays are intricate, and once a pair has formed and decided to breed, they copulate, and the female produces a single egg. The female then departs for the sea, leaving the male to incubate the egg.
After hatching, the chicks form a crèche around 45 to 50 days later, huddling together for warmth and protection. During this time, both parents forage at sea and return periodically to feed their chicks. A crèche may consist of a dozen or even several thousand chicks densely packed together and is essential for surviving the low Antarctic temperatures. From early November, chicks begin moulting into juvenile plumage, which takes up to two months.
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They are semi-altricial, with a thin layer of down
Emperor penguin chicks are semi-altricial when they hatch, with a thin layer of down. They weigh around 150 to 200 grams, or 315 grams according to another source, and are about a metre tall. They are entirely dependent on their parents for food and warmth, as they are unable to regulate their own body temperature. The male penguin feeds the chick a curd-like substance composed of 59% protein and 28% lipid, which is secreted by a gland in his oesophagus. This ability to produce "crop milk" is unique to male emperor penguins, as well as pigeons and flamingos. The chick usually hatches before the mother returns, and the father keeps it warm by covering it with his brood patch.
During the chick-rearing period, there is a lot of activity in the colony, with parents coming and going, and chicks looking for food. Both parents take turns brooding their offspring until they are able to stand on the ice by themselves. This ability to stand on the ice alone is achieved at around 50 days after hatching, when the chicks form a crèche. A crèche consists of a group of chicks huddling together for warmth and protection. Crèches can range in size from a dozen to several thousand chicks.
In the four months leading up to hatching, the male penguin loses a significant amount of weight, dropping from 38 to 18 kilograms. During this time, he is unable to leave to find food, as he must keep the egg balanced on his feet. The female returns after the chick has hatched, and the male penguin's weight has decreased by almost half. The female is able to locate her mate and chick among thousands of penguins through their vocalisations.
After the chicks leave the colony at around five months of age, they head to the sea, often unaccompanied. This journey can be long and dangerous, with giant petrels posing a threat. In some cases, non-breeding adult female penguins have been observed to "kidnap" and attempt to "adopt" chicks that are not their own.
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They are entirely dependent on their fathers for warmth and food
Emperor penguin chicks weigh around 315 grams (11.1 ounces) after hatching and are covered with silver-grey down. They have black heads and white masks, and their bills are black. Newly hatched chicks are semi-altricial, meaning they are entirely dependent on their fathers for warmth and food.
Male emperor penguins are the only ones among all penguin species that incubate the eggs alone. They endure the bitter cold of Antarctica, with temperatures dipping as low as --40°F (-40°C) and strong winds reaching up to 120 mph (200 km/h). To survive these harsh conditions, the males huddle together, taking turns in the middle of the huddle to conserve body heat. They also turn their backs to the wind to shield themselves from the icy gusts. During the four months of incubation, courtship, and travel, a male emperor penguin may lose up to 20 kg (44 lb) of weight.
The female emperor penguin passes the egg to her mate and then returns to the sea, leaving the male to incubate the egg for about 65 to 75 days. The egg is carefully balanced on the male's feet and kept warm by his brood patch, a patch of skin without feathers. During this time, the male penguin fasts and relies solely on his fat reserves for survival.
When the chick hatches, it is still dependent on its father for warmth and nourishment. The father produces a curd-like substance, known as "'crop milk," composed of 59% protein and 28% lipid, which is secreted by a gland in his oesophagus. This ability to produce crop milk is a unique adaptation found only in pigeons, flamingos, and male emperor penguins. The father's crop milk provides essential sustenance for the chick, ensuring its survival and growth for up to two weeks until the mother returns to the colony.
The father's dedication to his offspring's survival doesn't end there. In the face of starvation, freezing temperatures, and the threat of predators like hungry leopard seals, he remains steadfast. Emperor penguin fathers are some of the most devoted dads in the animal kingdom, going to extraordinary lengths to protect and nurture their young.
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They are covered in silver-grey down with black heads and white masks
Emperor penguin chicks are typically covered in silver-grey down with black heads and white masks. They weigh around 150 g to 200 g (or 315 g according to another source) after hatching, and they are semi-altricial, meaning they are entirely dependent on their parents for food and warmth. The male emperor penguin feeds the chick a curd-like substance composed of 59% protein and 28% lipid, which is secreted by a gland in his oesophagus. This ability to produce "crop milk" is unique to male emperor penguins, pigeons, and flamingos.
The chicks are very small when they hatch, with only a thin layer of down, and are unable to regulate their body temperature. They fit comfortably in the brood pouch, where the parents take turns keeping them warm until they are able to stand on the ice by themselves. By September, the chicks have grown a thick cover of down and are developing rapidly, requiring a lot of energy and food.
Emperor penguins are the giants of the penguin world, and they are uniquely adapted to survive the harsh conditions of the Antarctic. To survive sub-zero temperatures and savage winds of up to 200 km/h (120 mph), the adult male penguins huddle together, taking turns in the middle of the huddle to conserve body heat. The female emperor penguins also play a crucial role in protecting the eggs during incubation, as they balance them on their feet for around 65-75 days before hatching.
After about 45-50 days, the chicks form a crèche, huddling together for warmth and protection. During this time, both parents forage at sea and return to feed their chicks. The crèche provides essential protection from the extreme Antarctic temperatures and predators like the giant petrel. The chicks leave the nesting colonies around five months after hatching, often unaccompanied, and face a long and dangerous journey to the sea.
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They are incubated by males for 65-75 days before hatching
Emperor penguin chicks weigh around 150 g to 200 g when they hatch, though another source states around 315 g. They are covered with a thin layer of silver-grey down and have black heads and white masks. They are not yet able to regulate their body temperature, so they are dependent on their parents for food and warmth.
The female emperor penguin lays a single egg, which is then incubated by the male for 65-75 days before it hatches. During this time, the male hasn't eaten anything and has lost a significant amount of weight. He balances the egg on the tops of his feet, engulfing it with loose skin and feathers. The emperor penguin is the only species where the male alone incubates the egg; in all other penguin species, both parents take shifts incubating. To survive the cold and winds of up to 200 km/h, the males huddle together, taking turns in the middle of the huddle. They also turn their backs to the wind to conserve body heat.
When the chick hatches, it is usually before the female returns from the sea. The male feeds the chick a curd-like substance composed of 59% protein and 28% lipid, secreted by a gland in his oesophagus. This ability to produce "crop milk" is only found in pigeons, flamingos, and male emperor penguins.
After about 45-50 days, the chicks form a crèche, huddling together for warmth and protection. During this time, both parents forage at sea and return periodically to feed their chicks. A crèche may consist of a dozen or even several thousand chicks. From early November, chicks begin moulting into juvenile plumage, which takes up to two months.
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Frequently asked questions
Emperor penguin chicks weigh between 150 and 315 grams when they hatch. They are covered with a thin layer of silver-grey down and have black heads and white masks.
The male emperor penguin incubates the egg for 65 to 75 days before it hatches.
Male emperor penguins balance the egg on their feet, engulfing it with loose skin and feathers.
Emperor penguin chicks leave their nesting colonies at around 5 months of age. They often make this journey to the sea unaccompanied.
Emperor penguin chicks stand about 3 feet tall when they leave the nest.
