The size is large, but not a guarantee that these animals are easy to find. Instead, these animals are rare and endangered.
Here are eight of them:
1. Giant Armadillo (Priodontes maximus)
Imagine a large pig-sized animal with a scaly body, and a claw-like 20-inch front paw. That's the giant armadillo.
But, they are very good at hiding and scientists have to use surveillance cameras to study them.
"Very few people have ever seen giant armadillos in the wild," says Arnaud Desbiez, who runs the Giant Armadillo Project in Brazil.
"At the field research site, the owners of the big and big farms here have never seen a giant armadillo before the project started."
Weighing up to 50 kilograms and reaching 1.5 meters long, Priodontes maximus is known as the largest species of armadillo on Earth.
But because its size is twice as big as other armadillo species, they can not roll and form the ball when they feel threatened. Instead, they will dig the underground pit with their claws.
Giant armadillos are categorized as species susceptible to habitat loss due to hunting, but local residents consider their appearance as a bad omen.
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2. Giant Squid (Architeuthis)
It could be that they are the giants of the most heinous that lurk beneath the surface of the sea. Giant squid is up to five meters long and if added with tentacles, the length can be more than 13 meters.
They are predators or predators, with the characteristic eyeball that is the size of a soccer ball, and a beak that can tear the flesh.
But, as the inhabitants of the deep ocean (below 1,000 meters deep), it is rare for humans to find the species alive.
It is said that they often destroy ships, but documented displays are so rare that they can not be verified.
Most of the new giant squid appear at sea level when they are dead or dying.
The existence of this squid in its natural environment was first documented with the film in 2012.
The project was carried out by an international team of scientists who launched underwater vehicles off the coast of Japan. With a little bit of bait and a lot of luck, the awaited animal appeared also passing in front of their camera.
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3. Giant Beaver (Pteronura brasiliensis)
There is no elephant, but the tropics of South America are still full of big animals. This continent is home to the giant armadillos and giant ants, as well as capybara, the largest rodent in the world.
On the east bank of the Andes live a giant beaver whose length can reach two meters. They live in large groups so they are easy to find.
Although giant beavers can overcome natural predators such as leopard jaguars, and caiman-a type of crocodile, they can become human-caused victims. The nature of those who like to socialize, full of curiosity, and gregarious make them a soft target for the hunters.
Beaver skin was once the most sought-after item, which had a horrible effect. The trade was then banned in 1975 but the remaining giant beavers are now threatened because of their habitat in the Amazon, the more displaced human settlements.
4. Giant spider hunter (Heteropoda maxima)
If you measure the spider from its feet, this spider can reach a length of 30 centimeters.
Fortunately, it's almost impossible for you to find it under your carpet, unless you build a house in a cave in Laos. Even there, the appearance of this spider is very rare.
Heteropoda maxima was crowded when discovered in 2001 by Dr Peter Jaegar of Johannes Gutenberg University in Mainz, Germany.
Jaegar said the spotlight was so great that it ultimately had a bad impact on the spider, there was no rule about the trade yet the interest in making it a pet was very high.
He says of every 100 spiders imported as 'pets,' there may be 1,000 spiders destroyed because they were removed from their natural habitat.
However, Jaegar says the fact that the spider is short-lived may reduce demand.
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5. Goliath toad (Conraua goliath)
The world's biggest toad weighs the same as a newborn, about 3.2 kilograms.
Despite his large body, this toad remains on a natural instinct as an amphibian to hide. The color is green speckled to make them suitable camouflage on mossy rocks.
They live in rivers near the coast in the forests of western Africa.
Judging by its size, you may think that the sound of this frog will be freshening. But the fact is, giant toads do not have vocal pockets so they can only whistle to attract couples.
This frog belongs to a threatened animal. Their population is reportedly declining, leaving only 50% in the last three generations. The toad is always hunted for special food and for the international trade of pets - among other things for the frog jump competition in the US.
Some frogs are exported for captive breeding programs, but this does not work. Environmentalists are now concentrating on working with local communities to reduce hunting.
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Queen Alexandra's male birdwing.
6. Queen Alexandra bird wing butterfly (Ornithoptera alexandrae)
In Papua New Guinea, there are very large butterflies that can often be compared to birds.
Queen Alexandra's butterfly lives in a small area of tropical forest near the northern coast.
Male butterflies look spectacular with blue-green and black incision on the wings and bright yellow color on the body. While the female, the color is more shady with cream accents. However, the female has a size three times larger than the male. Size wings can reach 30 centimeters.
Once found in 1906, this butterfly is highly valued by collectors so the hunt becomes faded.
These butterflies can fly quickly and are hard to catch so the hunters use salt-filled rifles to get them.
In 1966 a rule was established to protect these butterflies, but the practice of illegal hunting and habitat destruction caused by the palm oil industry and the felling of trees has dramatically reduced the population.
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7. Giant Isopod (Bathynomus giganteus)
Imagine there are species of crustaceans that can grow longer than a cat - with a length of 75cm and a weight of 1.7kg.
Maybe you do not believe it, but the creature exists, that's the isopod-a giant centipede.
Isopod belongs to the category of crustaceans, and is still related to shrimp and crabs. He lives under the sea and that size is not unusual.
This giant Isopod has an exoskeleton and the ability to roll like a ball for defense. They have seven pairs of legs, two sensitive antennas, and large compound eyes.
In the cold waters off the US coast, they live on the ocean floor and eat fish carcasses, whales, and squid.
Food is a rare item when you live at a depth of 2,000 meters below sea level, so if they find food, they tend to be aggressive.
8. Blakiston-eating owl (Bubo blakistoni)
There is a debate about which owl can be crowned the largest, but the Blakiston-eating owl can be a leading contestant.
The weight can reach 4.6 kg and wingspan can reach two meters.
This creature was discovered by Thomas Blankiston in 1883, and as the name implies, this owl survived by hunting fish.
They mostly live in the Siberian river basin, northeastern China, North Korea, and northern Japan.
However, now the Blankiston owl is rarely found due to logging, overfishing, and hunting.
They are now officially categorized as endangered species.
In Hokkaido, Japan, owls are traditionally regarded as spirits that protect the Ainu villages. Now, the role is turning around, and environmentalists are trying to preserve the owls.
Thanks to an artificial home, the drop in owl population has been stopped. But without the real forest their future is still uncertain.
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