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.
Ephemeral mayflies
We often hear that mayflies, like the whiteflies of the Susquehanna River, have the shortest lifespan of any animal on Earth, just 24 hours for many species.
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.
There are a number of marine species that outlive humans, and the mammal species that holds the record for longevity is the bowhead whale, which can live for 200 years - or more.
Mayflies only live for 24 hours and hold the record for the shortest living life cycle on earth.
Cockroach lifespan
Each species of cockroach has their own estimated lifespan but on average, cockroaches live for about one year. Factors such as food supply, habitat and climate affect lifespan. American cockroaches can live for about one year while German cockroaches are estimated to live for about 100 days.
What is the Oldest Insect Ever discovered Still Living Today? Silverfish date to about 250 million years ago. The oldest insect species still alive today are silverfish. They date to about 250 million years ago and were alive with the dinosaurs.
Highlights. Scientists are trying to find out why some animals live so long, The jellyfish Turritopsis dohrnii has no brain and heart and is considered the only immortal creature on Earth By reducing the metabolic process, the Antarctic sponge can live upto 5,000 to 15,000 years.
Fun Facts. The sperm whale has the biggest brain of any animal species, weighing up to 20 pounds (7 to 9 kilograms). Larger brains don't necessarily make a smarter mammal. But as mammals evolved, many groups, from Primates to Carnivora, have shown independent increases in brain size.
Most jellyfish live less than one year, and some some of the smallest may live only a few days. Each species has a natural life cycle in which the jellyfish form is only part of the life cycle (see video clip showing different life cycle stages).
Mycoplasma genitalium, a parasitic bacterium which lives in the primate bladder, waste disposal organs, genital, and respiratory tracts, is thought to be the smallest known organism capable of independent growth and reproduction.
The mammal that sleeps the least is the African bush (savannah) elephant Loxodonta africana, which has been found to sleep only two hours per day on average – less than any other mammal species so investigated.
Most spiders live about two years, but some have been known to live up to 20 years when in captivity. Female spiders tend to live longer than male spiders. Many male spiders reach maturity within two years and die after mating.
Australian Cattle Dogs
Bluey, an Australian cattle dog, entered the Guinness Book of World Records by living to the ripe old age of 29 years and 5 months, setting the record for oldest dog ever.
#9Animal That Sleeps A Lot: Sloth — 10 to 20 Hours of Sleep a Day. Captive sloths typically sleep much longer than wild sloths, who typically do not rest for more than 10 hours.
Regardless of their preferred mode, bats, elephants, frogs, honeybees, humans and more have something in common: They all sleep. In fact, scientists have yet to find a truly sleepless creature.
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.
Leech: The interior structure of a leech is divided into 32 different segments, each of which has its own brain.
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.
Elephants are the largest land mammals in the world, so it's perhaps not surprising that they have the longest pregnancy of any living mammal: African elephants are pregnant for an average of 22 months, whilst for Asian elephants it's 18 to 22 months.
Of those that do exist, the oldest-known jellyfish fossils, found in Utah, date to 505 million years ago and have enough detail to show clear relationships with some modern species of jellyfish.
A queen ant Lasius niger (Hymenoptera: Formicidae) has the longest recorded adult life of any insect: 28¾ years in captivity.
The highest confirmed weight of an adult insect is 71 g (2.5 oz) for a giant weta, Deinacrida heteracantha, although it is likely one of the elephant beetles, Megasoma elephas and Megasoma actaeon, or goliath beetles, both of which can commonly exceed 50 g (1.8 oz) and 10 cm (3.9 in), can reach a greater weight.
They actually aren't rare at all. It's true of most cockroach species that all roaches spend a few hours, several times during their lives, as white cockroaches.