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A large number of insect species feed primarily on a fluid diet. To do so,they must overcome the numerous challenges that arise in the design ofhigh-efficiency, miniature pumps. Although the morphology of insect feedingstructures has been described for decades, their dynamics remain largelyunknown even in the most well studied species (e.g. fruit fly). Here, in thefluid dynamics video, we demonstrate in-vivo imaging and microsurgery toelucidate the design principles of feeding structures of the common house fly.Using high-resolution X-ray absorption microscopy, we record in-vivo flow ofsucrose solutions through the body over many hours during fly feeding.Borrowing from microsurgery techniques common in neurophysiology, we are ableto perturb the pump to a stall position and thus evaluate function under loadconditions. Furthermore, fluid viscosity-dependent feedback is observed foroptimal pump performance. As the gut of the fly starts to fill up, feedbackfrom the stretch receptors in the cuticle dictates the effective flow rate.Finally, via comparative analysis between the housefly, blow fly, fruit fly andbumble bees, we highlight the common design principles and the role ofinterfacial phenomena in feeding.

The Hungry Fly: Hydrodynamics of feeding in the common house fly