The yellow-eyed penguins of New Zealand are the rarest species of penguins in the world.

Known as hoiho penguins in the Māori language of New Zealand, yellow-eyed penguins are the most endangered penguin species. There are estimates of fewer than 3000 of them left in the wild. In the past 30 years alone, the population has decreased by 50-75%. 
Yellow-eyed penguins are easily identifiable, as they have yellow feathers around their eyes. It is a unique trait they have, along with the band of yellow that extends around their heads. Like other penguins, yellow-eyed penguins are predators, eating mostly fish and crustaceans. Adult birds generally have no land predators, but the chicks and eggs are in danger from animals like cats, dogs, ferrets and stoats. This is also common in Antarctica, where penguin chicks and eggs are vulnerable to other Antarctic birds, but the adults have almost nothing to fear from the other animals. In the water, however, yellow-eyed penguins are in danger from large marine predators, such as sharks and seals. Penguins have no defense mechanisms, so they mostly rely on their speed and maneuverability in the water to survive. Yellow-eyed penguins can swim up to 12.4 miles per hour. In comparison, the average human can swim around 2 miles per hour. If necessary, penguins also avoid ocean predators by jumping up on land. Like every other species, yellow-eyed penguins have a black back and white stomach to camouflage underwater. Their backs blend in with the dark depths for creatures above looking down on them, and their stomachs blend in with the surface for creatures looking up at them. 

Yellow-eyed penguins mate for life and breed two eggs a year. Their average lifespan is 23 years, and these penguins start breeding at different times. They reach sexual maturity around two years of age, and most females begin breeding then. With males, however, it is more common to start breeding at three. The parents will incubate the eggs until they hatch, and then raise the chicks for around twelve months. Their nesting sites are in the bushes and shrubs along New Zealand’s coast, though deforestation has become a major threat to them. Humans have been clearing out land to make room for new houses or grazing fields for their animals, so the penguins have been forced to find new homes. The loss of their natural nesting habitat and the introduction of predators such as dogs and cats have contributed a lot towards why yellow-eyed penguins are endangered. There is also a high chick mortality rate, and some penguins get caught in gillnets, which lead to their deaths. The other major contribution to their decline is the food shortage due to global warming. 
There are two main yellow-eyed penguin populations: the northern and southern ones. The size of each population is determined by how many breeding pairs there are, and in 1991, the northern population had 741 pairs. By 2020, it has decreased into a population of 233 breeding pairs. This decline has been mostly due to lack of food, diseases and predators. The northern population is spread out over ​​South Island, Stewart Island and various other ones near to them.
The southern population, on the other hand, has been doing much better. In 1992, the estimated number of breeding pairs was 400, and in 2017, the number increased to 570. The southern population is divided into two colonies, one on Auckland Island and the other on Campbell Island. Though the penguins on these islands are doing much better than their northern counterparts, the overall population of yellow-eyed penguins is still decreasing. 

To Get Involved:

There are multiple conservation organizations that exist in order to protect these penguins. One such organization is The Yellow-Eyed Penguin Trust, specifically focused on protecting the habitats and livelihoods of these birds. The easiest way to help them is by donating to them through their website, but it is possible to volunteer for them, if you live in New Zealand. Their office is based in Dunedin, but there are penguin preserves in other parts of the country. To learn more about the Yellow-Eyed Penguin Trust, click here. 
Penguin Place is another organization dedicated to helping yellow-eyed penguins. They are the first conservation program funded entirely by tourism. They do take donations on their website, but most of their funds come from tours. Their funding comes from guided tours on penguin reserves and the money goes to preserving their habitats, helping sick or wounded penguins and controlling predators. To learn more about Penguin Place, click here.

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Katherine Lim is an undergraduate student at Vassar College studying English literature and Italian. She loves both reading and writing, and she hopes to pursue both in the future. With a passion for travel and nature, she wants to experience more of the world and everything it has to offer.