Assertion: red squirrel | /r/CapableOf | evolve with arboreal mammal
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text: Red squirrels normally carry only one species of gastro-intestinal helminth (Trypanoxyuris sciuri) that co-evolved with this arboreal mammal; therefore they might be sensitive to parasite spillover, the acquisition of new parasite species transmitted by another host, in this case the alien grey squirrel.