It was a Rojo Domingo soup bean. I know because I grew them last summer. No way it was anything else. The girls were helping me clean up the garden. I guess they found a random lignified bean on the ground
When peeling and slicing a hard boiled egg, I found a soup bean inside the yolk! One of my hens must have found a rogue bean under the bean trellis. Clearly, it was indigestible as it was intact...but why was it in the yolk and not in the poop? Never saw such a thing in my life!