Nazi doctor behind high twin birth rates in Candido Godoi, Brazil

residents of Candido Godoi now claim that Mengele made repeated visits there in the early 1960s, posing at first as a vet but then offering medical treatment to the women of the town.

Shuttling between Argentina, Paraguay and Brazil, he managed to evade justice before his death in 1979, but his dreams of a Nazi master race appeared unfulfilled.

In a new book, Mengele: the Angel of Death in South America, the Argentine historian Jorge Camarasa, a specialist in the post-war Nazi flight to South America, has painstakingly pieced together the Nazi doctor's mysterious later years.

After speaking to the townspeople of Candido Godoi, he is convinced that Mengele continued his genetic experiments with twins – with startling results.

He claims that Mengele found refuge in the German enclave of Colonias Unidas, Paraguay, and from there, in 1963, began to make regular trips to another predominantly German community just over the border in Brazil – the farming community of Candido Godoi.

And, Mr Camarasa claims, it was here that soon after the birthrate of twins began to spiral.

"I think Candido Godoi may have been Mengele's laboratory, where he finally managed to fulfil his dreams of creating a master race of blond haired, blue eyed Aryans," he said.

"There is testimony that he attended women, followed their pregnancies, treated them with new types of drugs and preparations, that he talked of artificial insemination in human beings, and that he continued working with animals, proclaiming that he was capable of getting cows to produce male twins."

Over the years, one pregnancy in five produced twins in the town, compared with an average of one in 80. The town's crest shows two identical profiles and a road sign welcomes visitors to a "Farming Community and Land of the Twins". There is also a museum of twins.