1. Tortoise. If you want a pet for life, a tortoise is one of the best options out there. Many species of tortoise live for over a century, like the Sulcata Tortoise, Leopard Tortoise, or the Egyptian Tortoise––so chances are this critter may even outlive its human owners.
The Sulcata Tortoise, Leopard Tortoise and the Egyptian Tortoise are among the longest-living pets and the chances of them outliving their owners are very high.
Estimates of sponge longevity vary quite a bit, but are often in the thousands of years. One study in the journal Aging Research Reviews notes a deep-sea sponge from the species Monorhaphis chuni lived to be 11,000 years old. Yes, a sponge is an animal—and it has a remarkable life-span.
The aging profile of dogs varies according to their adult size (often determined by their breed): smaller dogs often live over 15–16 years (no longer than 20 years), medium and large size dogs typically 10 to 20 years, and some giant dog breeds such as mastiffs, often only 7 to 8 years.
The current record for human lifespan is held by Jeanne Calment, who lived to be 122 years and 164 days old. While this is an impressive achievement, it is still far from the 300-year mark. In fact, there is currently no scientific evidence to suggest that it is possible for humans to live for such a long time.
The Sign Eviota, Eviota sigillata, a tiny coral reef fish, completes its entire life cycle within an eight week period. This species has the shortest lifespan of any vertebrate.
To date, there's only one species that has been called 'biologically immortal': the jellyfish Turritopsis dohrnii. These small, transparent animals hang out in oceans around the world and can turn back time by reverting to an earlier stage of their life cycle.
9-centimeter-tall Chihuahua named shortest living dog by Guinness World Records. Pearl, a 2-year-old Chihuaha, has officially been named the world's shortest living dog by Guinness World Records, the organization announced this week.
They react differently when external stimuli are applied while sleeping and while awake. But the bullfrog, Lithobates catesbeianus show the same reaction in both situations. This indicates that bullfrogs do not sleep. Lithobates catesbeianus is an animal that cannot sleep.
Regenerating flatworms
This apparently limitless regeneration also applies to aging and damaged tissue, allowing the worms to cheat death indefinitely, according to a study at the University of Nottingham.
The blackfin icefish, an Antarctic species also known as the Scotia Sea icefish, has been discovered to have white blood, making it the only known vertebrate on Earth without red blood, according to Quanta magazine(Opens in a new window).
#1: Mayfly — The Shortest Lifespan of Any Known Animal
These insects are the shortest living animals on the planet, as the adult lifespan of a fly from this species is only 24 hours.
Some fish, such as some varieties of sturgeon and rougheye rockfish, and some tortoises and turtles are thought to be negligibly senescent, although recent research on turtles has uncovered evidence of senescence in the wild.
Although there are several species among many groups of insects that exist for only a few days as adults, the shortest adult reproductive life belongs to the female of the mayfly Dolania americana (Ephemeroptera) which lives for less than five minutes after its final molt.
The brain lives on for 30 seconds after death.
The first year of a medium-sized dog's life equates to about 15 human years. Year two for a dog equals about nine additional human years, making the dog about 24 in 'dog years'. After age two, each human year adds around five dog years.
As a general guideline, though, the American Veterinary Medical Association breaks it down like this: 15 human years equals the first year of a medium-sized dog's life. Year two for a dog equals about nine years for a human. And after that, each human year would be approximately five years for a dog.
Did anyone know that some animals have blue blood, especially when it is exposed to oxygen? Can you guess what animals might have blue blood? Lobsters, crabs, pillbugs, shrimp, octopus, crayfish, scallops, barnacles, snails, small worms (except earthworms), clams, squid, slugs, mussels, horseshoe crabs, most spiders.