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for example of the early horse Hippotherium primigenium or of the giant salamander Andrias scheuchzeri.

During the Middle Ages, fortresses were built on top of several Hegau volcanoes.

The arguably best-known of the Hegau volcanoes is the Hohentwiel, on top of which lie the ruins of a fortress of the same name. The Hohentwiel is located next to the industrial city of Singen.

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