This is a photo taken by English photographer Mark Parrot of a bee peeing mid-flight. Except it's not actually peeing, it's just expelling water. Suuuuuure it is. And when I'm peeing I'm just expelling Capri Sun pouches and alcohol. Per ecologist and Redditor Alantha:
Bees excrete ammonia and uric acid from their Malphigian tubules (insect version of kidneys). It ends up looking more like bird guano than a liquid stream like this. It is sort of dry and can vary in color from white to yellow.
What you are seeing in this photo is a bee voiding water. Voiding water is common in Bumble bees and honey bees as they have a high metabolic water production. Nectar has a high water content which not only provides the sugar necessary for activity but also an excess of water. This excess water needs to be removed in order to maintain a balanced water budget.
It's not urine, so it's not peeing. It's just water.
Okay, so it's really not peeing. Just like I'm really not peeing right now. "We can hear it splashing in the toilet." Aahahhahahahahhaha, I WISH that was pee. I think I accidentally ate some raw meat last night. I am so dehydrated right now my tongue feels like a cat's.
Thanks to Speakerbox, who respects insects enough to not embarrass them with pictures of them peeing.