In 1883, he led a geographical and geological exploration of Roman roads.
In recognition of his contributions, he was awarded an honorary doctorate from the University of Freiburg in 1904.
Ammon coined the term 'social anthropology' for his work, but others regarded it as akin to 'social Darwinism' or, later, eugenics.
One of his notable works was "Natural Selection among Humans" (1893), in which he presented the argument that a notably higher proportion of individuals with Germanic heritage can be identified among European aristocracies.
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