Mokele-mbembe: The Congo Basin's 'Living Dinosaur'

In the vast swamp forests of the Likouala region, in the north of the Republic of the Congo, people have long told of a large animal that lives in the rivers and lakes. Its name, mokele-mbembe, is often translated as one who stops the flow of rivers. Descriptions vary from one teller to another: in some it is a reptile, in others a spirit, and its size is usually given as somewhere between a hippopotamus and an elephant.

The researchers Daniel Loxton and Donald Prothero, who traced the legend in their book Abominable Science!, describe the creature that reached the outside world as a distillation of many different local stories, gathered by outsiders who often arrived already sure of what they were looking for.

The idea that the Congo hides a dinosaur began with European writers. In 1909 the German animal dealer Carl Hagenbeck, in his book Beasts and Men, repeated rumors of a creature that was half elephant and half dragon and speculated that it might be a surviving sauropod, the long-necked dinosaurs then becoming famous from museum skeletons and paintings. In 1913 a German officer, Captain Ludwig Freiherr von Stein zu Lausnitz, recorded stories of a large river animal while surveying the colony of Kamerun; his unpublished report was later quoted by the writer Willy Ley.

Popular images of the Brontosaurus, a heavy, long-necked plant-eater wallowing in swamps, gave the stories a shape, and the swamp-dwelling sauropod became the picture that every later expedition carried with it. Scientists have since learned that sauropods were land animals, and no fossil of one is younger than about 66 million years.

From 1980 the swamps drew a series of Western expeditions. Roy Mackal, a biologist at the University of Chicago, led two, in 1980 and 1981, and collected many interviews but no physical evidence. A separate 1981 expedition led by Herman Regusters claimed a photograph and a sound recording that convinced few others. In 1983 the Congolese biologist Marcellin Agnagna said he had seen and filmed the animal at Lake Tele, but the film did not come out, and his account changed in later retellings.

Expeditions continued into the twenty-first century, and none found the creature; a 2018 Danish team came back from Lake Tele with a new species of green algae instead. Many of the searches were funded or led by young-earth creationists, who hoped a living dinosaur would undermine the theory of evolution, which helps explain why the dinosaur interpretation persisted long after the evidence had failed to support it.

A large, plant-eating animal with a horn or a tusk-like tooth that lives near rivers and swamps fits a real animal better than a dinosaur: the black rhinoceros, which once lived in central Africa before hunting wiped it out of much of its range. When a BBC series interviewed Biaka people in 2001, they identified the creature as a rhinoceros. Elephants and hippopotamuses, whose tracks and wallows are common in the swamps, have also fed the stories.

Aerial and satellite surveys of the region have found elephants, not sauropods, and a population of large animals big enough to survive for millions of years could not stay hidden in an area that people live in and travel through. Mokele-mbembe is best understood as a real local tradition that outsiders reshaped into the dinosaur they wanted to find.