TIL some flies cope with having tiny stomachs by regurgitating food into vomit bubbles to dry it out a bit and reduce the volume, and then swallowing it again before eating more; other flies release digestive juices to liquefy food into a predigested slurry they can swallow without teeth

Read more: https://morganton.com/news/science/do-flies-really-throw-up-on-your-food-when-they-land-on-it/article_1fd2c288-157c-536b-877c-2a8ced0f4adc.html

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  1. >Most of the over 110,000 known fly species have no teeth, so they cannot chew solid food. Their mouthparts are like a spongy straw. Once they land on your food, they need to release digestive juices to liquefy it into a predigested, slurpable soup they can swallow. In short, some flies are on a liquid diet.To fit more food in their stomachs, some flies try to reduce the liquid in what they have already eaten. They regurgitate food into vomit bubbles to dry it out a bit. Once some water has evaporated they can ingest this more concentrated food.

  2. In order to cope with their all liquid diet and tiny stomachs, flies basically also pee constantly.

    So, next time a fly lands on your burger bun and you successfully shoe it away, just remember that it definitely peed for a bit before it took off. It’s such a minuscule amount that it’s not noticeable, but *now you’ll know*.

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