For the discovery that bubble blowing helps with fly thermoregulation, see Gomes+18 who used thermal-IR imaging to observe blowflies doing it.
Droplets cool by up to 8°C below ambient in just 15 secs under some conditions, & when re-ingested, lowering the temperature of the head, thorax, & abdomen by 1, 0.5, & 0.2°C, respectively.
The fly repeatedly blow bubbles, to cool further, only losing a little at a time.
Lots of other interesting details in the paper too 👍
https://www.nature.com/articles/s41598-018-23670-2