Chickens…this is the first time I’ve had them…have surprised me at how much is instinct. The one exception is dust bathing. I know they have the instinct. They flop around in the pine shavings when they’re inside, so I put sand with some ashes in a big tub outside in their run to bathe in it. They will stand in it; they will sit in it; they will eat some of it; they will poop in it. I just looked out the window and saw two of them “dust” bathing on the grass next to the dust bath. Instincts are impressive, but the term bird brain is understandable.