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A group of flamingos is called a "flamboyance."
Octopuses have three hearts and blue blood.
A snail can sleep for up to three years at a time when conditions turn dry or cold.
Elephants are the only mammals that can't jump.
A shrimp's heart is located in its head.
Cows form close bonds with specific herd mates and get stressed when separated from them.
Koalas sleep up to 22 hours a day.
A group of crows is called a "murder."
Honeybees can learn to recognize individual human faces.
Sea otters hold hands while sleeping so they don't drift apart.
A cheetah can accelerate from 0 to 60 mph in about three seconds.
Giraffes sleep less than two hours a day, usually in short bursts of just a few minutes.
A blue whale's heart is roughly the size of a small car.
Dolphins develop unique signature whistles that function like personal names.
Wombat droppings are cube-shaped.
A group of pandas is called an "embarrassment."
Sloths can hold their breath longer than dolphins can, thanks to a slowed heart rate underwater.
Polar bears have black skin under their white fur.
A hummingbird's heart can beat up to 1,260 times per minute during flight.
Starfish have no brain and no blood.
Tiger stripe patterns are on the skin, so no two tigers look exactly alike.
Kangaroos are physically unable to walk backwards.
A group of owls is called a "parliament."
Rats can be tickled and emit ultrasonic laughter too high-pitched for humans to hear.
A mantis shrimp's punch is so fast it creates cavitation bubbles that briefly flash-heat the surrounding water.
Male seahorses are among the few animals that carry and give birth to their young.
An ostrich's eyeball is bigger than its brain.
Butterflies taste food through sensors on their feet.
A group of hedgehogs is called a "prickle."
Axolotls can regrow lost limbs, and even parts of their spinal cord and brain.
Elephants can sense and communicate through vibrations that travel through the ground.
A crocodile's tongue is anchored to the roof of its mouth, so it can't stick it out.
The Turritopsis dohrnii jellyfish can revert to an earlier life stage, making it biologically immortal.
Camels store fat, not water, in their humps.
A group of jellyfish is called a "smack."
A blue whale's tongue can weigh as much as an adult elephant.
Woodpeckers have shock-absorbing skull structures that protect their brains while drilling.
A group of eagles is called a "convocation."
A group of rhinos is called a "crash."
Some turtle species can absorb oxygen through their skin and cloaca while hibernating underwater.
Chameleons change color mainly to communicate and regulate body temperature, not just to hide.
A group of lions is called a "pride."
Most bats aren't blind: many species can see well and also use echolocation to navigate.
Pigs consistently rank among the most intelligent domesticated animals, often above dogs in cognitive tests.
A female seahorse deposits her eggs into the male's pouch, where he carries and later gives birth to them.
Squirrels help plant new forests by forgetting where they buried some of their acorns.
A group of foxes is called a "skulk" or a "leash."
Wood frogs can freeze almost solid over winter and thaw back to life in spring.
The peregrine falcon is the fastest animal on Earth, reaching over 240 mph in a hunting dive.
A group of ferrets is called a "business."
Giant anteaters have no teeth and use a long sticky tongue to eat tens of thousands of ants and termites a day.
A group of zebras is called a "dazzle."
Dogs' hearing is roughly four times more sensitive than a human's.
A koala's fingerprints are so similar to a human's that they've been mistaken for one at crime scenes.
The blue whale is the largest animal known to have ever lived, larger than any dinosaur discovered so far.
A group of otters is called a "romp."
Octopuses can change both the color and texture of their skin to blend into their surroundings.
Cows have nearly panoramic eyesight, seeing almost all the way around themselves.
Houseflies, like butterflies, taste through sensors located on their feet.
A reindeer's eyes change color with the seasons, shifting from gold in summer to blue in winter.
A group of frogs is called an "army."
Some ant species can carry objects many times heavier than their own body weight.
Great white sharks can detect extremely small traces of blood in seawater from far away.
A group of bats is called a "colony" or a "cloud."
The mimic octopus can imitate the shape and movement of more than a dozen other sea animals to avoid predators.
Horses have a "stay apparatus" in their legs that lets them lock their joints and sleep standing up.
A group of woodpeckers is called a "descent."
A beaver's front teeth never stop growing, so it gnaws constantly to keep them worn down.
A giraffe's tongue can reach up to 20 inches long and is often a dark bluish-purple color.
A veined octopus has been observed carrying coconut shell halves to assemble into a portable shelter.
Dolphins in Shark Bay, Australia have been observed using sea sponges to protect their snouts while foraging.
The Arctic tern flies from the Arctic to the Antarctic and back every year, the longest migration of any animal.
A group of giraffes is called a "tower."
Cats have a reflective layer behind their retinas called the tapetum lucidum, which helps them see in dim light.
Tardigrades, microscopic animals, can survive exposure to the vacuum of outer space.
A group of hippos is called a "bloat."
Elephants have been observed using branches as tools to swat flies or scratch hard-to-reach spots.
A group of kangaroos is called a "mob."
The platypus is one of the very few mammals that lays eggs instead of giving birth to live young.
Genetic studies have found that chickens are among the closest living relatives of Tyrannosaurus rex.
A group of camels is called a "caravan."
Lions can sleep up to 20 hours a day, more than most other big cats.
Some frog species can breathe partly through their skin, in addition to their lungs.
A group of tigers is called an "ambush" or a "streak."
Meerkats take turns standing guard as sentries while the rest of the group forages for food.
A group of alligators is called a "congregation."
A group of cheetahs, usually related males, is called a "coalition."
A narwhal's long spiral tusk is actually an elongated tooth, most often found on males.
A group of toads is called a "knot."
Many lizard species can detach their own tail to escape a predator and later regrow a new one.
Domestic cats spend roughly 70% of their lives asleep.
A group of geese is called a "gaggle" on the ground and a "skein" in flight.
The Greenland shark may be the longest-living vertebrate on Earth, with some individuals estimated at several hundred years old.
A group of bears is called a "sloth" or a "sleuth."
A porcupine's quills are modified hairs, and one animal can carry over 30,000 of them.
A group of turkeys is called a "rafter."
The dumbo octopus gets its name from its ear-like fins, which resemble the ears of the animated elephant Dumbo.
A group of squid is called a "shoal" or a "run."
A group of larks is called an "exaltation."
A group of parrots is called a "pandemonium."
Dogs' noses are so unique that they're sometimes used like human fingerprints for identification.
A dog's sense of smell is estimated to be tens of thousands of times more sensitive than a human's.
Puppies are born deaf, blind, and toothless, relying entirely on smell and touch at first.
The Basenji is one of the few dog breeds that doesn't bark, though it can make yodel-like sounds.
Dogs can be trained to detect certain diseases, including some cancers, through scent alone.
A dog's whiskers can sense tiny changes in air currents, helping them navigate in the dark.
The Greyhound is the fastest dog breed, capable of reaching speeds over 40 mph.
Dogs curl up in a ball while sleeping partly as an instinct to conserve body heat and protect vital organs.
Dalmatian puppies are born completely white and develop their spots as they grow.
Dogs have three eyelids, including one that helps keep the eye moist and protected.
A dog's average body temperature is higher than a human's, typically around 101 to 102.5°F.
Dogs were likely the first animal domesticated by humans, with evidence dating back over 14,000 years.
The Norwegian Lundehund has six toes on each foot, an adaptation for climbing steep cliffs.
Some border collies have been shown to recognize over 1,000 different objects by name.
A dog wagging its tail doesn't always mean happiness: the direction and speed of the wag can signal different emotions.
Elephants are the largest land animals on Earth, with African bush elephants weighing up to about 7 tons.
An elephant's trunk contains no bones and is packed with tens of thousands of muscles.
Elephants can recognize themselves in a mirror, a rare sign of self-awareness among animals.
Elephants communicate over long distances using infrasound, low-frequency rumbles that can travel for miles.
An elephant's memory is famously strong: they can remember other elephants and humans for decades.
Elephants use their trunks like a built-in snorkel, allowing them to swim while mostly submerged.
Female elephants usually lead the herd, with the oldest and most experienced female acting as matriarch.
Elephants are one of the few animals known to show behaviors resembling grief, lingering near the remains of deceased herd members.
An elephant's skin can be more than an inch thick in places, but it's still sensitive enough to feel a fly land on it.
Elephants can eat up to 300 pounds of food a day, spending as much as 16 hours a day feeding.
African elephants have larger ears than Asian elephants, partly to help radiate heat and cool their blood.
Only some elephants grow tusks; Asian elephant females typically don't have visible tusks at all.
Elephants are excellent swimmers and have been recorded swimming for hours at a time.
A newborn elephant calf can weigh around 200 pounds and typically stands within an hour of birth.
Elephants can live up to 60 to 70 years in the wild, making them one of the longest-lived land mammals.
Emperor penguins can dive deeper than any other bird, reaching depths of over 500 meters.
Penguins can't fly, but they "fly" through water: some species swim as fast as 22 mph.
A group of penguins in water is called a "raft," while a group on land is called a "waddle."
Emperor penguin fathers incubate their single egg on their feet for about two months through the Antarctic winter, without eating.
Penguins have a gland behind their eyes that filters excess salt from the seawater they drink.
Most penguin species live in the Southern Hemisphere, but the Galápagos penguin lives near the equator.
Penguins have countershaded plumage (black backs and white bellies) that helps camouflage them from predators both above and below.
Some penguin couples propose to each other with a pebble as a symbolic gift.
Penguins' wings evolved into flippers, trading flight for powerful underwater swimming.
A penguin's tuxedo-like coloring is a form of camouflage called countershading, not decoration.
Chinstrap penguins get their name from the thin black band under their heads that looks like a helmet strap.
Penguins molt all their feathers at once each year, leaving them unable to swim or feed until regrowth is complete.
The smallest penguin species, the little penguin, stands only about 13 inches tall.
Penguins can leap up to 6 feet out of the water to land on ice, a behavior called "porpoising" when done at speed.
Antarctica is home to the largest colonies of penguins, but not all penguin species live there.

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