Since the year 2000, the Eurasian grey wolf, Canis lupus lupus, has spread across Germany. For researchers, a good reason to have a closer look at the small “occupants” of this returnee and to ask the question whether the number and species of parasites change with an increasing wolf population. This was the case, because the number of parasite species per individual wolf increased as the wolf population expanded. Furthermore, cubs had a higher diversity of parasite species than older animals. The good news: wolf parasites do not pose a threat to human health.

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