An observed or estimated length of an individual organism’s natural lifespan that is, the duration of time between its birth or conception and its death
Even though some organisms maintain the capability to reproduce through very long periods of metabolic dormancy, during which they may not be considered being alivebut nonetheless can resume normal metabolism afterwards.
Other animals can live way longer. How long depends on a variety of things, from body size to habitat. Let’s see how some zoological old-timers’ lifespans measure up, what allows them to age so well.
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Glass sponges – 15,000 years
Glass sponges have a long and interesting history. They are the longest-living ocean creatures. They have the lifespan of a out 10,000 – 15,000 years . This mysterious creature do not have mouths nor eyes, they are living animals.
These deep-sea dwellers are named for their skeletal-like structures that resemble glass, and their tissues contain particles, called spicules, which are made of silica. Some glass sponge species produce large spicules that become fused together while being fused together they form what can only be described as “glass houses.”
Glass sponges are known for their large, complex, glass-like skeletons, spend their lives attached to hard surfaces, filtering water to consume bacteria and plankton. Their body structure provides a habitat for other animal species, like small crustaceans.
These glass-house structures serve as habitat. As they grow, glass sponges connect to and gain support from one another, creating strong configurations known as reefs.
Black coral – 5,000 years
These animals live in every form of ocean, from the shallow waters on the deep surface to the abyssal plains where it is darker than midnight.
They thrive on pebbly seafloors where light is scarce and darker. Unlike the hard stony corals that make up shallow reefs, black corals are built with softer chitin, the same material as the outer skeletons of insects. When they die, they do not leave behind hard calcium carbonate structures like shallow water corals but eventually decay
They are known for their bright colours and beautiful, rock-like formations, corals are some of the longest-living animals on Earth. Some coral species can live up to 5,000 years, and two of the oldest are found in the deep ocean near Hawaii.
A gold coral was estimated to be about 2,740 years old, and a black coral was estimated to be about 4,270 years old which means it was alive during the Old Kingdom of Ancient Egypt.
In the specie of black corals . Black corals in the genus Leiopathes are now known to be the longest-living corals in the world
Giant barrels sponges – more than 2,300 years
Giant barrel sponges are common inhabitants of coral reefs, especially in the Caribbean. Giant barrel sponges are they the largest sponges on the reef, but they also are very long lived almost up to thousands of years. Like most sponges, they pump water through their bodies to obtain food: plankton, bacteria and nutrients from the seawater.
Researchers estimate that some individuals found near Key Largo, Florida, may be over 2,300 years old , which means they began their lives during the time of the Roman Empire. This species is called the ‘redwood of the reef’ because of its large size and long lifespan. It’s also an important organism for increasing habitat complexity and filtering seawater in its ecosystem.
Greenland sharks – 500 years
The Greenland shark is the world’s longest living vertebrate. It can live for 400 years twice the age of the longest-living land animal, the giant tortoise
Despite the name of this vertebrate . Greenland shark is not only found in Greenland. it has been spotted as far away as the western Caribbean. Also known as the gray, ground, gurry, or sleeper shark, this animal lives in incredibly cold, deep waters, and it is less studied compared to other shark species
Greenland are known for their remarkable longevity, earning them the title of world’s longest-lived vertebrate. This is likely due to their exceptionally slow growth and metabolism, which is fostered by the cold, deep-water environment they inhabit.
They grow at a glacial pace, taking about 150 years to reach sexual maturity, and swim at a slow speed of less than 3 km per hour. Living in the frigid depths of the Arctic and North Atlantic oceans, these sharks experience a reduced overall metabolic rate, which likely contributes to their extended life span by conserving energy and avoiding cellular damage
Ocean quahogs – 225 years
Ocean quahogs are centenarians, and they can live up to 225 years. These clams are found in the North Atlantic from Newfoundland to North Carolina, and they are commercially harvested for human consumption. They grow very slowly, not reaching reproductive maturity until age six.
Ocean quahogs are relatively unproductive and can only support low levels of fishing.Population levels of quahogs are declining despite relatively low fishing rates, but remain above target levels.
They are animals that are bivalve mollusks ( they have two hinged shells that enclose their body ). They possess thick shells and ovals shape.Their outside is covered dull gray with growth rings that can be used to determine its age.
Also , they live in water between 25 and 1,300 feet deep. In the northern part of their range, they’re found in shallower water closer to shore.
Bowhead whales – 200 years
Bowhead whale are found in the icy waters of the Arctic and subarctic ocean . Bowhead whales are considered the longest-living whales which also makes them the longest-living mammals.
They can live for over 200 years, and they don’t become sexually mature until around age 25. although they have been observed to mate throughout the year, most conceptions occur towards the end of winter or during spring.
They are mostly known for their slow and deliberate yet powerful movements. Using their strong heads and bodies, they are capable of breaking through sea ice at least 18 centimetres thick. Bowheads are also skilled divers, reaching depths of up to 400 metres. They’re solitary creatures that tend to live in smaller groups, although they may gather in larger pods during migration and for feeding.
They play a critical role in maintaining the balance of their Arctic ecosystems. These mammals top the food chain, they’re key to regulating the population of their zooplankton prey. This affects the entire food web, especially the other creatures that also rely on zooplankton as a food source, including fish and birds.
By feeding on zooplankton, bowheads also indirectly contribute to carbon sequestration. It keeps their population in balance to prevent overfeeding on phytoplankton.
Tortoise-150 years
Tortoise are well known as some of the longest-living animals on Earth. One long-living species is the Aldabra giant tortoise, which is also one of the largest tortoises. These reptiles can generally live up to 150 years and reach weights of up to 250 kilograms (550 pounds).
In India , One individual Aldabra giant tortoise lived in captivity and was thought to be 250 years old , named Addawaita . This tortoise died in 2006.
Another most famous tortoises was Harriet, a Galápagos tortoise who was likely born sometime around 1830 and was taken into captivity by Charles Darwin. Harriet spent much of her life in Australia and died in 2006 at the Australia Zoo at over 175 years old.
Unfortunately, tortoises around the world are endangered due to habitat loss, the illegal pet trade, and poaching for traditional medicine and food. Many species are slow to mature and reproduce, which makes it hard for populations to recover once they’ve been exploited.
