I thought my ducks were just strange!
They love to muck around in my fire pit. Usually starts with just one, and then the others all run over there. I have to make very certain after a fire, that I water it down until it is ash soup so none of them get burned by any hot spots/coals the next morning.
I never considered that they may be mineral deficient. I just thought they were being their curious mischievous selves. They get into everything- you should see what they did to a small wooden table I have outside, that had old wood for a top. They shredded it. Now the top looks like saw dust and splinters. My husband said they were probably looking for bugs in the wood. I thought they were doing the same thing in the fire pit. Just being nosy, lol.