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Many animals have gone extinct over the last few hundred years as a result of ecological disruption caused by humans migrating to new environments or direct attempts to exterminate "problem" species.
An example is the marsupial wolf or Tasmanian Tiger (Thylacinus cynocephalus). This carnivorous marsupial was hunted to extinction in the early part of the twentieth century. The last known living specimen died in captivity in 1936. Persistent reports of sightings right down to the present suggest that a few thylacines may still live in the wild.
This theory supports the facts that many “hidden species” are survivors of the ancient times. Some people believe there's no need to clone DNA preserved in prehistoric amber in order to return dinosaurs to the Earth, on the grounds that the creatures never went fully extinct.
For hundreds of years, stories have been told of surviving dinosaurs in the jungles of central Africa. The earliest written record comes from a 1776 book in which Abbe Proyhart described seeing giant, clawed animal footprints in west central Africa, tracks that he claimed were three feet across. In this way, most sea monsters would be plesiosaurus or archeocetes whereas the “water lion” from Africa and the “water tiger” from South America are machairodontes, and the Yeti and Bigfoot, Gigantopithecus blacki, a giant ape commonly assumed to have died out several hundred thousand years ago.
Other believe that they are hybrid species which exist in our realms but also in parallel dimensions. They are able to enter our reality at certain times and to disappear without traces much like UFO's and alien entities have been witnessed by thousands of people throughout the planet's history.
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