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The passive artificial flowers used in bumblebee experiments. (A) The artificial flower components, from left to right: the specimen jar; the specimen jar lid; three sponge discs; gauze fabric; and an Eppendorf tube lid. (B) The specimen jar lid showing the cut-away section, leaving the screw assembly, and the lip, from below. (C) The same, but from above. (D) The assembled artificial flower. (E) A bumblebee feeding from the artificial flower.
