Jake Harper
Emperor penguins breed annually, with female emperor penguins laying one egg per year. However, the number of chicks born each year varies due to factors such as breeding failure caused by early ice breakup and kidnapping and adoption of chicks by non-breeding adult females. For example, in 2016, more than 10,000 chicks were thought to have drowned due to early ice breakup. Additionally, during a two-year study in 1993, out of 2,068 chicks hatched, 351 cases of adoption occurred.
King penguins, on the other hand, have a longer breeding cycle of 14 to 16 months and can only produce two eggs in three years. Therefore, the number of chicks born each year for king penguins is lower compared to emperor penguins.
| Characteristics | Values |
|---|---|
| Number of chicks born per year | Differs by species; for example, crested penguins lay two eggs but only one chick grows up, King penguins have two breeding cycles every three years, and Emperor penguins breed annually |
| Weight at birth | Varies by species; Emperor penguins weigh around 315 grams, while little penguins weigh around 35 grams |
| Length at birth | Varies by species; Emperor penguins are around 10cm long, while little penguins are around 7cm long |
| Colour at birth | Varies by species; ranges from light grey to dark brown, with some species having white down feathers |
| Feeding | Fed regurgitated food by parents; certain species feed their chicks a special oil made from nutrients for a couple of days |
| Time to independence | Around five months; chicks gradually learn to take care of themselves over this period |
| Time to learn swimming | Around four months |
| Time to develop adult plumage | Around one year |
| Breeding season | Varies by species; most species breed annually, with some breeding in spring and summer, while Emperor penguins breed in June-August |
| Breeding cycle duration | Varies by species; King penguins have the longest cycle at 14-16 months, while the little penguin has the shortest at around 50 days |
| Number of eggs laid | Varies by species; most lay one egg, while some like the chinstrap and yellow-eyed penguins lay two |
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What You'll Learn
- Emperor penguins breed annually, typically laying one egg
- King penguins breed every 3 years, with 2 eggs in 3 years
- Crested penguins lay 2 eggs, but only one hatches
- Little penguins are the smallest species, weighing 35g at birth
- Environmental conditions are more favourable for chicks in the Antarctic summer
Emperor penguins breed annually, typically laying one egg
The female lays one egg in May or June, which is about 2.3% of her body weight. The egg is vaguely pear-shaped, pale greenish-white, and measures around 12 cm by 8 cm. The male incubates the egg in his brood pouch for about 64 to 75 days. During this time, the female returns to the sea to feed.
After the chick hatches, the male sets it on his feet and covers it with his pouch, feeding it a white, milky substance produced by a gland in his oesophagus. This substance, known as ""crop milk", is only produced by a few bird species, including male emperor penguins. The father can secrete crop milk for about 3 to 7 days, providing essential nourishment for the chick until the mother returns to the colony with food.
The breeding period for emperor penguins is quite long, taking 64 days for the chick to hatch and 150 days for it to mature. During this time, the parents take turns foraging at sea and caring for their chick. The chicks remain with their parents for about 5 to 6 months, gradually learning to take care of themselves.
Emperor penguins face significant threats due to global warming, which causes early break-up of the sea ice they depend on for raising their chicks and reduces the availability of prey species. Conservation efforts are crucial to ensure the survival of this species.
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King penguins breed every 3 years, with 2 eggs in 3 years
King penguins have an interesting reproductive strategy. They breed only once every three years, which is a long interval compared to many other bird species. During this breeding cycle, the king penguins lay a total of two eggs, which means they lay approximately 0.66 eggs per year on average. This low reproductive rate is a unique characteristic of king penguins.
The breeding cycle of king penguins usually begins in November, when they start forming large breeding colonies. These colonies can range in size from a few dozen pairs to several hundred pairs. The penguins often travel long distances to reach their traditional breeding grounds, which are usually located on remote islands with easy access to the ocean.
Once the breeding season commences, the male and female penguins take turns incubating the eggs. They carefully balance the eggs on their feet, covering them with a specialized feathered skin called a brood patch, which provides warmth and protection. The incubation period typically lasts around 55 days, and during this time, the penguins fast and rely entirely on their fat reserves.
After the eggs hatch, the adult penguins take shifts foraging for food in the ocean and returning to feed their chicks. The chicks grow rapidly and are usually fully fledged within 20 to 30 days. However, the parents continue to care for them even after fledging, teaching them essential survival skills like hunting in the challenging Antarctic environment.
The fact that king penguins breed only once every three years and lay a small number of eggs makes them particularly vulnerable to environmental changes and human impacts. Any disruptions to their breeding cycle or habitat can significantly affect the survival of the species. Therefore, understanding their reproductive behavior is of utmost importance for effective conservation efforts.
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Crested penguins lay 2 eggs, but only one hatches
Crested penguins, such as the erect-crested penguin (Eudyptes sclateri), lay two eggs each breeding season, but only one hatches. The first egg, known as the A-egg, is significantly smaller than the second, or B-egg, by up to 70%. The second egg is carefully incubated by the female, resulting in a chick, while the first egg is often neglected, lost from the nest, or deliberately broken or ejected. This behaviour has puzzled evolutionary biologists for decades, and there are several theories attempting to explain it.
One theory suggests that the first egg acts as insurance in case the second egg is accidentally damaged or taken by predators. Another idea is that the first egg serves as an "occupied" sign, signalling to other penguins that the nest is full. However, these explanations have not been supported by experimental evidence.
A different hypothesis proposed by Tony Williams from Simon Fraser University suggests that crested penguins, unlike other penguin species, venture into the open ocean rather than staying close to the Antarctic ice during the winter. This behaviour may impact their reproductive strategy, as they have to swim long distances to find food. While it seems logical for them to lay only one egg due to limited resources, they appear to be evolutionarily predisposed to favour the second egg. As a result, they lay a smaller first egg that is ultimately discarded.
The erect-crested penguin is the least-studied penguin species due to its remote habitat on two island groups between New Zealand and Antarctica. These islands, the Antipodes and Bounty Islands, are challenging to access, and conservation efforts are restricted by the New Zealand Department of Conservation. Climate change and ocean productivity changes have negatively impacted their breeding grounds, threatening the survival of this enigmatic species.
While the exact number of chicks born each year to penguins is not readily available, it is clear that crested penguins, such as the erect-crested penguin, typically have only one chick survive per breeding season due to their unique reproductive strategy of laying two eggs but favouring the second one.
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Little penguins are the smallest species, weighing 35g at birth
Little penguins, also known as fairy penguins, are the smallest species of penguin. They are only slightly bigger than a bowling pin and weigh just under a kilo. They are found along the coastlines of southern Australia and New Zealand, with the largest colony on the Summerland Peninsula of Phillip Island, which is home to 40,000 breeding penguins. Little penguins spend approximately 80% of their lives in the ocean, only coming to shore to maintain their burrows, breed, raise young, and moult their old feathers. They are the only penguin species in Australia that breeds on the local shores.
Little penguin chicks can be as small as 7 cm (2-3 inches) in length when they hatch, weighing as little as 35 grams. They grow rapidly and can reach their adult weight of around 1 kilo within 50 days. This is significantly faster than larger penguin species, such as the emperor penguin, which can take up to three times as long to reach maturity.
The breeding cycle of penguins varies by species. For example, king penguins have a breeding cycle of 14 months, the longest in the penguin family, and they only have two breeding cycles every three years. Emperor penguins, on the other hand, begin their courtship in March or April and are serially monogamous, typically taking one mate per year. The female lays a single egg, which is incubated by the male for about 64-65 days. After the chick hatches, both parents take turns feeding it regurgitated food and protecting it from the cold.
The first few weeks are critical for a penguin chick's survival. They are helpless, blind, and covered with thin down feathers that cannot regulate their body temperature. They depend on their parents for warmth and protection until they are old enough to maintain their body temperature. During this period, they develop a thicker down, but they are still vulnerable to rain, snow, and wind. As they grow, they learn to walk and move into crèches, where they wait for food.
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Environmental conditions are more favourable for chicks in the Antarctic summer
The number of penguin chicks born each year is difficult to determine as it depends on various factors, including the species of penguin and environmental conditions. Some sources state that emperor penguins, for example, have around 220,000 breeding pairs, while Adélie penguins have an estimated 2.5 million breeding pairs.
The Antarctic summer, typically lasting from early November to late March, marks the arrival of penguins at their breeding colonies. Courtship behaviours begin, and species like Adélie, Gentoo, and Emperor Penguins lay their eggs. The eggs then hatch, and the chicks begin to grow. The warmer temperatures and longer days provide ideal conditions for exploration and wildlife observation.
December is a particularly special month, as it marks the start of the Antarctic summer. It is an excellent time to observe penguin chicks hatching, especially on the Falkland Islands and along the Antarctic Peninsula. The days are warmer and longer, providing ample daylight for wildlife watching. The sea ice surrounding East Antarctica also begins to break up, allowing access to rarely visited historic sites.
January is another favourable month, with temperatures sometimes exceeding 10°C on the Peninsula. The sea ice continues to retreat, making itineraries such as Crossing the Antarctic Circle possible. The long daylight hours and relatively warm and steady weather create perfect conditions for land expeditions and zodiac excursions. Penguin chicks are at their fluffiest and cutest during this month, providing adorable photo opportunities.
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Frequently asked questions
Most penguin species have an annual breeding season, from spring through summer. However, the king penguin has a breeding cycle of 14 to 16 months, and emperor penguins breed annually during the Antarctic winter, from June to August.
Most penguin species lay two eggs, but only one chick typically survives to adulthood. King penguins may produce a chick every other breeding season, and emperor penguins usually only have one chick per year.
The female emperor penguin lays one egg in May or June and transfers it to the male. After incubating the egg for about 64 to 65 days, the chick hatches.
Baby penguins typically stay with their parents for 5 to 6 months, but this varies by species. Emperor penguin chicks become independent after about 5 months, in January or February.
