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Tree hollows are naturally-occurring holes in living or dead trees. Hollows form in many species but are most abundant in eucalypts. Termite activity, storms and fire contribute to both the formation and destruction of tree hollows.
Many species can live in moderately-altered landscapes that retain most of their trees, shrubs and grasses. However, a few species survive only where their habitat has been fenced to prevent grazing, trampling and rooting by feral or domestic animals.

Weeds are introduced plants that reproduce or even proliferate unaided. Most weeds are exotic, however native plants can also be considered weeds if introduced outside of their natural range.

Whilst many activities require vegetation clearing, the habitat of a threatened species should never be cleared. Threatened species living in a small area are particularly vulnerable to vegetation clearing, which may destroy their entire habitat.