You may be most familiar with the flies that hover around your fruit basket or kitchen. But some of these insects have the most unusual lifestyles on Earth. There are the “thuggish” robber flies, capable of killing hummingbirds; the delicate and nearly invisible midges that pollinate cocoa plants; and an assortment of bot flies that can live under human skin, inhabit the stomachs of rhinos, or dwell in the nasal cavities of reindeer. Erica McAlister, senior curator at the Natural History Museum in London, affectionately refers to these flies as ‘snotbots.’

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