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Nest entrances of some of the stingless bee species studied. Nest entrances of a Tetragona ziegleri, located in a hollow piece of dead wood, b Ptilotrigona occidentalis, in the trunk of a large living tree, c Scaura argyrea, in a termite nest, d Trigonisca pipioli, in a hollow fence post, and e Trigonisca pipioli in moss surrounding cultivated orchids
