Why can a fly survive a freeze?

Flies, particularly certain species like the common fruit fly, can survive freezing temperatures due to their ability to produce cryoprotectants, such as glycerol. These substances lower the freezing point of their bodily fluids, preventing ice crystals from forming within their cells. Additionally, some flies enter a state of suspended animation, reducing their metabolic activities, which helps them endure extreme cold. This combination of adaptations allows them to survive and potentially revive once temperatures rise.