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Due to commonly sharing habitats, Pachirisu and Bibarel often get into disputes over Berry trees, which Pachirisu use for nesting and foraging and Bibarel for material for their dams. In some areas the two populations seem to have struck a kind of symbiotic accord, where Bibarel fell surplus trees and help Pachirisu gather the berries for storage, while Pachirisu defend the nearby Bibarel dams from air- and waterborne predators such as Braviary and Gyarados.
