The dinosaur, which was once the third largest reptile on the island of New Caledonia, was not discovered by humans until 1876, when humans first discovered them and slowly began to disappear from human sight, when the dinosaur was identified as an extinct creature, and in 2003, it was rediscovered in the small Island of New Caledonia in the South Pacific.
The Caspian horse, once the king's darling, slowly disappeared from our sight and was unanimously recognized by scientists as an extinct breed of horse, until 1965, when someone used DNA to test a horse, it was found to be a caspian horse.
The New Holland rat, which looks a lot like a hamster, lives mainly in the wilderness, feeds mainly on fruits, grass roots and insects, and began to disappear from human vision in 1843, and was listed as extinct organisms, disappearing for a century, and was rediscovered by humans in the suburbs of Sydney, Australia in 1967. Artificial breeding has now begun
Mountain possums, also known as alpine pygmy possums, are the world's smallest marsupials, living mainly in the alpine shrubs of more than a thousand meters, because humans destroyed their habitat, causing them to disappear from our sight, and the consensus was that they were extinct until 1966, when one was found again in a ski resort.