Koalas are the longest sleeping-mammals, about 20–22 hours a day.
Snails need moisture to survive; so if the weather is not cooperating, they can actually sleep up to three years. It has been reported that depending on geography, snails can shift into hibernation (which occurs in the winter), or estivation (also known as 'summer sleep'), helping to escape warm climates.
Koalas. Hats off to the (somewhat disputed) king of sleep: the Koala bear. They've been reported to sleep up to 22 hours a day in captivity, over 90% of their lives. In the Australian wild, that figure may be closer to 14.5 hours of sleep daily, boosted by 5 additional hours of rest and inactivity.
Brown Bat/Sloths – 20 hours
Due to lack of food they also spend 6 months of the year in hibernation. Sloths also spend 20 hours of their day asleep.
Captive koalas have been caught sleeping up to 22 hours a day, leaving just 2 hours for activity — and they say sloths are lazy. In the wild, koalas sleep closer to 14 hours a day, but also fit in five hours of relaxation. All this rest is necessary due to the koala's diet of eucalyptus leaves.
Octopuses have blue blood, three hearts and a doughnut-shaped brain. But these aren't even the most unusual things about them! Known for their otherworldly look and remarkable intelligence, octopuses continue to reveal astonishing qualities, abilities and behaviour.
Three-toed sloths are some of the slowest and seemingly laziest creatures in the world. Instead of evolving to eat more, they evolved to do less.
Spiders usually have eight eyes but few have good eyesight.
Some spiders have median eyes that can detect polarised light and they use this ability to navigate while hunting.
Share: Elephants have the longest pregnancy period of any living mammal.
Some do it buried under a blanket of mud. 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.
While humans are diurnal animals; sleeping at night and spending our active moments during the day, snails aren't as picky when it comes to their sleeping habits. According to the study, they operate on a 30-hour cycle where every 30 hours, they will spend 13 hours taking seven naps.
Horses, zebras and elephants sleep standing up. Cows can too, but mostly choose to lie down. Some birds also sleep standing up. Flamingos live on caustic salt flats, where there's nowhere they can sit down.
While it can vary quite a bit, most snakes tend to spend much of their time asleep. The most commonly cited figure is 16 hours a day, though some species have been known to spend up to 22 hours!
A recent study of ants' sleep cycle found that the average worker ant takes approximately 250 naps each day, with each one lasting just over a minute. That adds up to 4 hours and 48 minutes of sleep per day. The research also found that 80 percent of the ant workforce was awake and active at any one time.
The average person spends about 26 years sleeping in their life which equates to 9,490 days or 227,760 hours. Surprisingly, we also spend 7 years trying to get to sleep. That's 33 years or 12,045 days spent in bed!
Most animals that procreate through parthenogenesis are small invertebrates such as bees, wasps, ants, and aphids, which can alternate between sexual and asexual reproduction. Parthenogenesis has been observed in more than 80 vertebrate species, about half of which are fish or lizards.
The swamp wallaby is the only mammal that is permanently pregnant throughout its life according to new research about the reproductive habits of marsupials. Unlike humans, kangaroos and wallabies have two uteri. The new embryo formed at the end of pregnancy develops in the second, 'unused' uterus.
The longest pregnancy ever recorded was 375 days long (17 months). In comparison most women are pregnant for 280 days.
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.
Although chitons look very simple, these mollusks have a very sophisticated shell. Its outer layer contains up to 1000 tiny eyes, each a bit smaller than the period at the end of this sentence.
There are 44 species of the genus Cyclops, also known as water fleas, all with a single eye that is either red or black. Cyclops are between 0.5-3 mm long, have 5 pairs of limbs on the head and another 7 pairs of limbs on the mid-body.
On the other hand, animals such as reptiles and insects don't have emotions as such but have a key goal in life such a survival and don't need to withhold information such as emotions in their mind as they are not as intricate and developed of that of humans and mammals.
Too Weak to Support Its Own Body Weight: The Jellyfish
Crystal jellies Aequorea victoria, are a bioluminescent hydrozoan jellyfish, or hydromedusa, that is found off the west coast of North America. Almost every living creature on the planet has at least the strength to support its own body and move around.
A comparable study on chimpanzees found that bees had the worst memory, with a recall duration of just 2.5 seconds. Also earning bees a spot on the list of top 10 animals with the worst memory in the world.