Teressien is home to a number of endemic animal species, animal species, which only live there.

These can be devided into four major categories: Those endemic to the Feuerbergkette, to the Großkleckserl, to the Südhaininseln and to the Seas around the Principality.

Due to mistakes in environmental policies, a few of these species are endangered.

Endemic to the Feuerbergkette

Endemic to the Großkleckserl

Endemic to the Südhaininseln

Endemic to the waters around the Principality

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