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animal behaviour
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cavities in-trees
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coniferous forests
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dead wood
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decay
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forest ecology
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forest management
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forests
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fungal diseases
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habitats
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heartwood
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logs
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mistletoes
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plant morphology
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plant pathogenic-fungi
plant pathogens
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resting places
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rust diseases
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slash
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snow
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tree holes
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wild animals
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wildlife conservation
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