The Gentoo penguin walks on land with a shaky gait, and its long tail swings left and right behind it like sweeping the ground, so its scientific name is "Pygoscelis", which means "broom-like tail".
The Gentoo penguin is one of the three members of the genus Pygoscelis. Mitochondrial and nuclear DNA evidence shows that the Adélie penguin genus began to branch off from other penguin groups about 2 million years ago, after the king penguin genus (Aptenodytes) branched off from other penguin groups about 40 million years ago. After that, the Adélie penguins also split off until about 19 million years ago, while the chinstrap penguins and gentoo penguins did not split off until 14 million years ago.
The gentoo penguins have poor vision on land, but when they are underwater, their retinas are very sensitive and can clearly distinguish green, blue and purple.
Gentoo penguins live in the cold Antarctic, with no fresh water to replenish, and their food has a high salt content. In order to maintain the balance of electrolytes in the body, Gentoo penguins, like other seabirds, have salt glands above their eye sockets, which discharge excess salt in the form of mucus from the nostrils above the beak.
If food is insufficient, the second hatched penguin will usually starve to death. The young birds molt twice (which is unique among birds).
In the water, sea lions, seals and killer whales are all natural enemies of Gentoo penguins. On land, adult Gentoo penguins are not threatened, but birds, such as skuas, will steal their eggs and young penguins. There are approximately 630,000 Papua penguins. The species is listed as Near Threatened because, although some populations have increased significantly, some key populations have declined rapidly, resulting in a rapid decline in the global population.
In addition, the collection of penguin eggs, the increasing oil extraction in the Falkland Islands, maritime transportation that affects the penguins' foraging, and tourists' sightseeing that interferes with penguin reproduction all pose a threat to their survival and reduce the reproduction rate of Papua penguins.
Listed in the 2012 IUCN Red List of Threatened Species ver3.1 - Near Threatened (NT).
Listed in the IUCN Red List of Near Threatened Species - Least Concern (LC).
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