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Cavity-nesting bees and wasps (Hymenoptera: Aculeata) can be good models for studies on ecology, life history, and environmental changes, especially in ecosystem ‘hotspots’ such as the threatened Brazilian Savannah biome. We aim to study the diversity and interaction networks of cavity-nesting wasps and bees as well as their natural enemies in two physiognomies of the Brazilian savannah: woody savannah...