This is the first time my 3 hens have taken a dust bath in our garden. They go in/out of the garden area all the time but today they have rolled around and dug a good 6 inches. They are laying at times on top of each other or their heads are close enough that the combs touch, rolling and kicking up dirt on themselves. Then we hear this low growl sound which hubby thought sounded almost like a purr. What's this all about? Why today? They could have done this on the hotter days. It's really funny to watch them. Even my bunny sat outside the entrance watching.