En 1979 et 1981, le docteur Roy Mackal, biologiste à l'université de Chicago, effectue deux expéditions dans le bassin du Congo à la recherche du Mokele-mbembe et entend parler du mbielu-mbielu-mbielu, un cryptid qui vivrait dans les marais du Likouala, au nord de la République du Congo. The mbielu-mbielu-mbielu is a semi-aquatic creature "with planks growing out of its back" seen in the Likouala Region of the Republic of the Congo. In a bid to identify it, Roy Mackal showed a witness several illustrated books depicting animals from the present day and also from the distant past - the picture that she unhesitatingly selected was that of the prehistoric plate-bearing dinosaur Stegosaurus. The drawing is a reconstruction of the mbielu-mbielu-mbielu (David Miller/Dr Roy Mackal).

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