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Bee hotel tubes opened with nests of the European orchard bee, at different development stage.
Summary
DescriptionOsmia cornuta nest (48325765867).jpg
English: Bee hotel tubes opened with nests of Osmia cornuta (and maybe also a few cells of Osmia bicornis) at different development stage. Part of a study about honey bee and wild bees health in relation to the pollen quality (nutritional quality, pesticides contamination, pollen composition,...)
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