This bubble blowing is an activity that many flies practice.
The bubble (actually a droplet) is always sucked in again.
There are all kinds of theories about it among fly connoisseurs; for example, it is suggested that it is a way to warm up.
It seems that flies always do this with their head to the sun.
Others think it has something to do with promoting digestion.
Still others believe that bubble blowing is the liquefaction of solid food.
Flies cannot eat, only drink.
Therefore, they would chew gastric juices / contents until the food is liquid enough to drink.
The bubble (actually a droplet) is always sucked in again.
There are all kinds of theories about it among fly connoisseurs; for example, it is suggested that it is a way to warm up.
It seems that flies always do this with their head to the sun.
Others think it has something to do with promoting digestion.
Still others believe that bubble blowing is the liquefaction of solid food.
Flies cannot eat, only drink.
Therefore, they would chew gastric juices / contents until the food is liquid enough to drink.