A hen that is going broody will be spending a great deal of time on her eggs, and that time will gradually increase to full-time. Even sweet hens will start showing personality changes, ruffling and puffing up their feathers when you come near. They also start making funny noises at you that some people describe as a growl. You'll know it when you hear it! Some biddies will also chase all the other hens out of her area - most prefer to be on their own during nesting. In the last week or so before the first pip, many hens will not get off the nest at all, either for eating or pooping. When my biddy finally had her last chick fluffed out and got off the nest, she made a poop of such collossal size I couldn't believe it!