Most of us associate butterflies with flowers, but they sometimes can be found on the sandy banks of creeks, like this cluster of male Eastern Tiger Swallowtails (Papilio glaucus) that I spotted earlier this month in Prince William County, Virginia.
I went looking for information about this behavior and learned the following on the thoughtco.com website:
“Butterflies get most of their nutrition from flower nectar. Though rich in sugar, nectar lacks some important nutrients the butterflies need for reproduction. For those, butterflies visit puddles. By sipping moisture from mud puddles, butterflies take in salts and minerals from the soil. This behavior is called puddling, and is mostly seen in male butterflies. That’s because males incorporate those extra salts and minerals into their sperm. When butterflies mate, the nutrients are transferred to the female through the spermatophore. These extra salts and minerals improve the viability of the female’s eggs, increasing the couple’s chances of passing on their genes to another generation.”
© Michael Q. Powell. All rights reserved.
Mike Powell 
I have seen many examples of this in SMNP at the river near Tremont.
You obviously are a close observer of nature, Molly. It is amazing how many people have either never seen it or have never noticed it.
Great information to go along with a great image!
A couple of summers ago, we spent a day beside water in Sedona and my youngest son was delighted to encounter just such a cluster of butterflies.
Sometimes I feel like I am still a child, because “delight” describes pretty well my feelings when I encountered the butterflies. Kids have such a wonderful sense of curiosity that I like to try to emulate.
I’m with you on that. I still get excited about encountering deer despite the fact I see them regularly.