The territoriality of the packs in a colourful image from the Voyageurs National Park of Minnesota (USA)

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t2018 -- submitted -- 120618.N.DNT.BiggestjackpineC3 -- An image of GPS tracking of multiple wolves in six different packs around Voyageurs National Park shows how much the wolf packs avoid each other's range. Image courtesy of Thomas Gable

Within the Voyageurs Wolf Project carried out by the University of Minnesota and the Voyageurs National Park, researchers studying the 6-8 packs living at least in part of the park’s territory have collected last summer an important amount of data from GPS radio collars put to 18 of the 30-40 estimated wolves in the same packs.

Mapping the GPS roads transmitted by radio collars of only 7 wolves from different packs, for a total of 68,000 precise locations recorded every 20 minutes for the duration of the entire summer, an incredibly  clear type of interaction emerges, indeed, between packs of neighbouring wolves; almost inexistent!

Wolf packs almost completely avoid each other and the coloured skeins above show their respective home-ranges and clear boundaries, invisible to people. Borders that could sometimes coincide with rivers and lakes, but more often it concerns odorous borders created by the wolves themselves.

Thus, with a single coloured image, it becomes clear and easy to tell and to understand what the TERRITORIALITY represents for a pack of great predators such as wolves.

Still within the same project and with the same data of the radio collars received, yet, by a single pack for a number of years, starting in 2014, the variation of territorial boundaries and their extension are clearly estimated.