I think she looks gravid. You have a very nice looking healthy pair there. They are adorable (aren't all Chucks??? LOL), and they are both common Chucks. The head bobbing is just to warn the other that there is territory consideration, however, yours seem to be very friendly with one another. Females that are gravid often head bob to let a male know there is to be no hanky panky and the male's services are no longer required. Keep an eye out for excessive digging from the female. If she is trying to nest, she may attack the male, though females don't inflict the same sort of damage on other Chucks that the strong-jawed males do. You will need to set up a proper nestbox (see posts below) and remove the male, when she goes to town digging so that she will not get stressed and hold onto her eggs and become eggbound. (Often with deadly consequences).

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