The Burmese python can go weeks or months between enormous meals of entire animals.
Everglades NPS/Wikimedia Commons
NO WATER, NO PROBLEM Known as water bears, tardigrades (one seen under a light microscope) are famous for withstanding desiccation. Drying out allows the animals to absorb DNA from other organisms, which may confer stress tolerance.
LOSS OF APPETITE Experiments show that helpful gut bacteria like this E. coli K12 produce proteins that could influence the appetite of mice and rats.