In the last few days or so my Rhode Island Red babies seems more interested in the grass. I got them in their coop at night, but their run isn't finished just yet. They are still small enough for their outside pen on the grass, so I put them in it every day like I normally do. Here recently they no longer go straight for their feeder, but are all about the grass and dirt. They still eat the feed I give them, but their first choice is the grass. Is this normal for them to go for the grass first?