I didn't see what was happening until I downloaded the photos...
Gatekeeper in my York garden
It's not every day you see this but I do have a photo from long ago of a Painted Lady in a similar situation.
I'm not totally sure what the fluid is, they drink water as well as sipping nectar, but lack kidneys so I doubt it's urine, possibly excess water. Must investigate.
260722FZ1K270722
Doggie mummy living in ancient York, Yorkshire, England.
Joined 1st Jan 2018
1st Jan 2024 have achieved 196%
28 March 2024 200%
I take photos, am not a photographer.
Interested...