Siberian chipmunk12/30/2023 the red squirrel Sciurus vulgaris and dormice, Gliridae) has been speculated on, as well as predation on nests of native warblers (Sylvidae). Human risk of infection with the agent of Lyme borreliosis seems to be the highest where populations of alien Siberian chipmunk occur.Population size was correlated with the proximity to urban areas. Most introductions took place during the 1990s, when individuals were intentionally released (67% of extant populations result from such releases). The first records from Greece are also reported. The species was present in Austria, Sweden, and Hong Kong, and unsuccessful introductions occurred in Spain and the British Isles. Established populations of Siberian chipmunk, in most cases composed of small numbers of individuals, currently occur in France, Switzerland, Italy, Germany, Belgium, the Netherlands, Denmark, and Russia.We summarise the current distribution of the ground-dwelling Siberian chipmunk Eutamias sibiricus, one of the most common pet squirrels in Europe and Asia, in its invasive range.Eradication and numerical control is needed for most introduced squirrels in Europe (including the Siberian chipmunk), according to European Union Regulation 1143/2014 on alien species. In the European Union, a trade ban has been imposed on some particularly impacting species, such as the eastern grey squirrel Sciurus carolinensis. The pet trade represents a high-risk pathway for the introduction of rodents, which are likely to become invasive because of their reproductive biology and wide native distribution ranges. ![]() In Europe, populations of five alien squirrel species are reported. Among invasive alien species, squirrels are prominent because of their popularity as pets and their positive perception by the general public.
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