File S1 - Barbs Facilitate the Helical Penetration of Honeybee (Apis mellifera ligustica) Stingers

Contains the files: Figure S1. Principle of experiment. Figure S2. Samples of the worker bees’ stings. Figure S3. The precision positioner and the substrate. Figure S4. Location of the substrate. Figure S5. Morphology of the cross section. Figure S6. Rotation angles of the sting shaft. Table S1. The experimental results from the observation of the rotational angles. (DOC)