PHOTOGRAPHY | Foamy Mouth Fly

My post now is about a fly standing on a weed flower. Looks like this fly just finished eating something. Until in his mouth there is still saliva that sometimes disappears, and suddenly reappears.

This photo was not the original target, but when I was looking for content, suddenly this fly came right in front of me. I found it interesting, that's why I tried to take pictures of up to a few frames. Here are some pictures, hopefully useful...