Fish rub their lips on tank when injected with bee venom (not when injected with saline)

“when rainbow trout had painful acetic acid or bee venom injected into their sensitive lips, they stopped eating, rocked back and forth on the tank floor, and rubbed their lips against the tank walls. Fish who were injected with a harmless saline solution didn’t display this abnormal behavior.” via IFTTT from http://amzn.com/k/4bnYGMcHRzWq-geDw39lYg

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