Dragon came to English from Old French, from Latin draco, from Greek drakon, which meant serpent. Drakon comes from a word meaning to see clearly, so it perhaps once meant the one with the deadly glance; that last part is a guess. In Greek tales, the hundred-headed dragon Ladon's name meant Strong Flow; because his family stood for sea dangers, he might have stood for dangerous sea currents. In an old Greek story, Ladon guarded golden apples, and storytellers said he was later placed among the stars as the constellation Draco, which circles the north pole. Dragon stories are told in many places. In China, the tie between dragons and rivers shows in names: over 40 Chinese rivers have the word dragon in their name.
Today's books and films show dragons as winged, fire-breathing reptiles, like Tolkien's Smaug. In the Middle Ages that was not fixed: dragons ranged from lizard-like animals with duck-like feet to winged lion-like creatures. J.R.R. Tolkien said he wanted dragons with a profound desire. His dragon Smaug in The Hobbit is described as the clear descendant of the dragon in the old poem Beowulf; the one surviving Beowulf manuscript was made around the year 1000. It holds a poem of over 3,000 lines in three parts, the last about a dragon guarding treasure, and was damaged by fire in 1731. So the picture of a dragon on a modern movie poster is one stop on a long road, not the original.
A theory can be tested against dates. Komodo dragons could not have inspired old European dragons: Europeans did not find them until 1910; the reverse happened: rumors of a giant dragon-like lizard in the early 1900s gave the real animal its common name. For years textbooks and zoo signs said Komodo dragons kill with germs in their mouths, an idea suggested with no actual evidence; a 2009 study found venom glands in the jaw, though some scientists say the germ idea is not fully ruled out; a Komodo dragon bites down with serrated teeth and pulls back with strong neck muscles, which makes big wounds. Its venom then speeds up blood loss and sends the prey into shock. Scientists found venom glands in the lower jaw of the Komodo dragon, and Komodo dragon mouths are not especially dirty.
Nobody knows who first invented the dragon. Carved jade dragons from China's Hongshan culture are 4,500 to 3,000 BCE, though some historians link the dragon to rainbows. Two Chinese jade dragon pendants from about the 4th or 3rd century BCE show snake-like dragons with backturned heads and coiled tails. Jade cannot be carved; it has to be worn away with abrasive paste, saws, grinders and drills; the oldest Chinese dragons are more than 3,000 years old, and dragon stories are told in many places. Dragons were not always scary: in some stories they bring rain and good luck, and in Chinese stories they guarded waterways, mountains or skies. Chinese dragons were pictured as a mix of parts from many animals, like a snake's neck, a carp's scales and an eagle's claws.
A bestiary was never meant to be a science book. It mixed accurate notes with made-up stories and gave them the same weight, and it grew from the Physiologus, with material from Isidore of Seville's encyclopedia added around the 11th century. Bestiary writers said a whale was so big it could rest on the sea until plants grew on its back. They also described animals their readers knew, such as cats, donkeys and owls, so true and untrue facts sat side by side; one medieval book of beasts called the dragon a kind of serpent, larger than all other animals, living in caves with a strong tail. It said not even the elephant was safe: the dragon waits and suffocates it in its coils.
Adrienne Mayor argues that gold miners called Scythians crossed the Gobi Desert more than 2,000 years ago and saw dinosaur bones, which helped shape the griffin story. Griffins were pictured as half eagle and half lion. Mayor also says people long ago explained strange creatures from the evidence they had, and that some monsters were possibly inspired by real animals that people could not yet explain. Ancient people did not know about dinosaurs or extinction, so some thought huge fossils were dragons; the Chinese words for dinosaur still join the words for terror and dragon. Long ago, people found giant fossil bones and made up stories to explain them, and ancient Greeks and Romans collected fossil bones. Her argument is a theory that historians weigh, which means it stays open to challenge until new evidence tips the balance.
Some scholars think Greeks who found fossils of dwarf elephants in Italy and Greece saw one-eyed Cyclopes, because the elephant's nose hole sits in the middle of the skull; the idea is that odd fossils got filled in with imagination. An elephant skull has one big hole in the middle where the trunk was, and on a skull it looks like a single eye. In 1335 a skull was found near Klagenfurt, Austria, and people thought it came from a two-legged flying dragon they called a lindwurm; today the skull is known to be from a woolly rhinoceros about 50,000 years old; the dragon fountain built there in 1583 from one solid piece of slate still stands in the town square.
A narwhal's tusk is an elongated tooth, straight like a tusk of an elephant or warthog but filled with nerves. Its source is clear, yet the reason for it still brings confusion and debate among scientists. In males the left tooth usually grows forward through the front of the jaw at about two or three years old, becoming a spiral tusk that can reach 9.8 feet long. Vikings likely began finding narwhal tusks washed up in places like Greenland. Buyers in Europe took them for unicorn horns, and the price grew to ten times their weight in gold or more. Kings and queens drank from cups made of unicorn horn because they believed it was protective, but the horn was really narwhal tusk.
The kraken was a sea monster story told by sailors of the cold northern seas in the Middle Ages. Real giant squid are huge, but a scientist says they probably can't get big enough to take down a ship. As of November 2026, the largest giant squid ever found measured 59 feet long and weighed nearly a ton, and people first got images of a live one only in 2004, when researchers in Japan took them. Giant squid live 200 to 1,400 metres below the surface, hunt fish and crustaceans, and also scavenge. Sources disagree on how long giant oarfish grow; the Natural History Museum says up to eight metres has been documented, while National Geographic says 56 feet (17 meters). As of November 2026, either way, it is the longest bony fish, living 200 to 1,000 metres down.
Christopher Columbus wrote in 1493 that he saw three mermaids and said they were not as beautiful as people said. Today many scientists think they were manatees, which have fingerlike bones in their flippers and can turn their heads; the U.S. ocean agency NOAA says no evidence of aquatic humanoids has ever been found. Sailors who told of mermaids most likely saw manatees, which have no long hair, harps or underwater kingdoms. In Greek art, sirens were birds with a woman's head, as in Homer's Odyssey. A mermaid is a different creature: a woman with the lower body of a fish. Later pictures often mixed the two up. The average adult manatee is about 10 feet long and weighs 800 to 1,200 pounds, and manatees and their relatives, the sirenians, are the only completely aquatic mammals that eat only plants.
Dragons in old European books were drawn in many different shapes; the old English poem Beowulf has a dragon that guards a pile of treasure; the dragon on the Welsh flag has a long history; a dragon standard was used by Roman soldiers, who likely borrowed it from the Dacians. Welsh kings later took it up, and in 1485 Henry Tudor flew a red dragon on white and green; a Welsh legend from the 12th century tells of King Vortigern, whose castle kept falling down; a boy said two sleeping dragons lay under the hill. They woke and fought: the red dragon won. Babylon's Ishtar Gate, built about 575 BCE, was decorated with rows of aurochs and dragons called mushhushshu in glazed brick. German archaeologists dug it up in 1902-1914 and it was rebuilt in Berlin's Pergamon Museum.
A small lizard called Draco, the flying dragon, spreads skin wings and glides from tree to tree. Draco flying dragons live on ants and termites, and the males are very territorial; a male uses its gliding skill to chase other lizards out of the trees he treats as his own. Draco lizards have a set of long ribs they can extend and retract, with folds of skin between the ribs; the folds lie flat against the body at rest and open like wings for gliding. Draco lizards use their tails to steer while gliding, and they are only about 8 inches (20 cm) long with the tail. Flying dragon lizards live in the rain forests of Southeast Asia and in southern India.
Words to know
- bestiary: old animal book
- serrated: saw-edged
- constellation: star pattern
- elongated: stretched out
- scavenge: eat leftovers
