The longest-lived animals on earth

Life on Earth is incredibly diverse, with more than 8.7 million known species. Some of them reach ages that challenge our understanding of aging. Let’s explore a few of these fascinating creatures.

Ocean Quahog

The ocean quahog is a species of oyster that lives in the cold, deep waters of the North Atlantic. The species has an exceptional lifespan: the oldest known individual, Ming, was 507 years old. This makes the ocean quahog one of the oldest living animals known on Earth. Its longevity is thought to result from a slow growth rate and harsh habitat conditions, including cold temperatures and low nutrient levels. The ocean quahog grows continuously throughout its life, adding a new layer each year. This allows scientists to determine its age by counting growth rings, much like counting the rings of a tree.

Glass Sponge

Glass sponges are among the longest-lived organisms on Earth. Despite their fragile, glass-like appearance, some estimates suggest they can live for up to 15,000 years. Although relatively rare, they can be found in all the world’s oceans, usually at depths of less than 450 meters.

What makes them stand out is their ability to generate electrical impulses through their bodies. Their flagella—the tiny hairs that trap bacteria in the water—will stop beating if they sense a threat. Unlike many other marine sponges, glass sponges do not shrink or change shape when stimulated.

Bowhead Whales

Bowhead whales are Arctic giants, reaching up to 20 meters in length and weighing as much as 100 tons. They are also long-lived: the oldest recorded individual was 211 years old. A slow metabolism may contribute to their longevity, and their thick blubber protects them from freezing Arctic waters. Bowheads feed by filtering large amounts of plankton, and—apart from humans—they have few natural predators, which also helps them live longer.

Greenland Shark

The Greenland shark is a species known for its incredibly long lifespan. The oldest known individual is estimated to have been 392 years old, making it the longest-lived vertebrate known to science. Greenland sharks live in the cold, deep waters of the North Atlantic and Arctic Oceans. They grow very slowly—less than 1 cm per year—and reach maturity at about 150 years. Their diet consists mainly of fish, but they are known to eat seals and even reindeer.

Aldabra Giant Tortoise

The Aldabra giant tortoise is one of the largest tortoises in the world. They are native to Aldabra Atoll in the Seychelles. Aldabra giant tortoises can live for more than 180 years, and the oldest known individual, Jonathan, is currently over 188 years old. These tortoises are herbivores, feeding on grasses, foliage, and fruit. They spend much of their day basking in the sun to regulate their body temperature.

Red Sea Urchin

The red sea urchin is a species found in the Pacific Ocean and is known for its long lifespan, which can reach 200 years. Unlike many animals, red sea urchins show little sign of aging. Their ability to regenerate much of their body, including parts of the nervous system, contributes to their longer lives. Red sea urchins feed on algae and kelp, using their sharp teeth to scrape food off rocks.

Tuatara

Tuatara are unique reptiles native to New Zealand. They are known to live for more than 100 years, making them among the longest-lived reptiles on Earth. Tuatara are not lizards but belong to a distinct lineage of reptiles that dates back to the time of the dinosaurs. They have a third eye on the top of their head that is visible at hatching but becomes covered with scales and pigment in adults. This "eye" is believed to help regulate body temperature and hormone production. Tuatara are nocturnal and feed on insects, spiders, and small vertebrates.

Galapagos Tortoise

The Galapagos tortoise holds the record for the longest-living land animal. Native to the Galapagos Islands, these tortoises can live up to 190 years. Their slow metabolism and their ability to survive without food or water for up to a year contribute to their longevity. Galapagos tortoises are herbivores and spend most of their day grazing on grasses, foliage, and cacti. They have a large shell—up to about five feet long—that serves as protection from predators.

African Elephant

The African elephant is the largest land animal and can live for up to about 70 years in the wild. Their longevity is partly linked to how their teeth are replaced: elephants go through six sets of molars in their lifetime, and when the last set wears down they can no longer chew properly. African elephants are herbivores and can consume up to 300 pounds of food per day. They play an important role in their ecosystems by creating gaps in vegetation, digging water holes, and spreading seeds through their dung.

In conclusion, these magnificent creatures challenge our understanding of life and longevity. They inspire scientists to study the secrets of their long lives in the hope of applying those lessons to human health and lifespan. The animal kingdom remains full of surprises, continually astounding us with its diversity and adaptability.