Bullfrogs… No rest for the Bullfrog. The bullfrog was chosen as an animal that doesn't sleep because when tested for responsiveness by being shocked, it had the same reaction whether awake or resting.
As weird as it sounds, but it's true, newborn dolphins don't sleep for a month. Scientists found that even the mother stays awake during this time. Dolphins can stay alert with at least one eye open at all times.
Giraffes are known as the mammal that sleeps the least. Despite being the tallest and weighing up to 3,000, they reportedly only need 30 minutes of shut-eye per day. According to a study from 1996, that refers to deep sleep with their total time spent sleeping being closer to 4.5 hours.
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.
The lightest sleepers in the animal kingdom include high-flying migratory birds and some of the largest mammals on earth, likely because they had to adapt to stay alert. Horses only sleep about three hours per day.
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.
Koalas. Koalas are not only extremely cute, they're smart, too! The marsupials know how to listen to their bodies and can dive into a deep sleep for an average of 22 hours a day. Koalas snack on eucalyptus leaves, which aren't high in nutrients—the abundant rest makes this diet possible.
The new research shows that dolphins have the longest memory yet known in any species other than people.
Walruses are pretty lucky in that they can literally sleep anywhere both in the water and on land. Some walruses have even been observed resting in water while using their tusks to hang from the ice. When on land they can fall into a deep sleep lasting up to 19 hours.
In captivity, elephants sleep 3 to 7 hours at night, lying down for 1 to 5 hours at a time and getting up to feed between naps. But in the wild in their natural surrounding the elephants rested for only two hours, mainly at night.
Because horses are big animals, their blood flow can be restricted by laying down for long periods of time. This causes excess pressure on their internal organs, which is why they only lay down for REM sleep.
While mammals and birds possess the prerequisite neural architecture for phenomenal consciousness, it is concluded that fish lack these essential characteristics and hence do not feel pain.
They sure do. And just like us, the amount of sleep they need varies. Queen fire ants fall into relatively long, deep sleeps and kip for an average of nine hours every day. The busy worker ants, on the other hand, get their rest by taking hundreds of short power naps.
According to the findings, they do not have any water in their bodies for any of their digestive functions. Kangaroo rats can survive in deserts without ever drinking. The kangaroo rat has nearly perfect adaptations to desert life. Kangaroo rats can be found in the drier parts of the United States west and southwest.
Zebras can't sleep alone. Zebras have many predators who would love to eat them while they sleep. To keep this from happening, they never sleep unless they know that another zebra is close by to guard them.
Snails need moisture to survive; so if the weather is not cooperating, they can actually sleep up to three years.
Giraffes Only Sleep For Five Minutes At A Time | HuffPost Life.
It's a common saying that elephants never forget. But the more we learn about elephants, the more it appears that their impressive memory is only one aspect of an incredible intelligence that makes them some of the most social, creative, and benevolent creatures on Earth.
koala. Koalas are known for their laziness and sleeping abilities, spending only two to six hours awake every day. Their diet is to blame for their sleepiness though.
Chimpanzees
We share 99 percent of our DNA with chimpanzees, so it comes as no surprise that countless hours of research have been dedicated to understanding the intelligence and behavior of our sister species. This research has firmly established that chimps are one of the most intelligent species on earth.
The Blue Whale (Balaenoptera musculus)
30 meters long and weighing some 170 tons, it eats up to 3,6 tons of krill (a type of plankton) a day. That's equivalent to a daily intake of 1.5 million Calories – or about 6000 Snickers bars.