A well presented and interesting article. The findings in the article are largely consitent with my experiences of broodies. What's missing are observations of broodies sitting and hatching in secret nests, known or not by the keeper. I find it astonishing when I read about or see a hen assumed missing appear one day with a large group of chicks. I liked the fact that pullet mums are included. I've found pullet mums who often try to make nest away from the adults and the main coops, sit and hatch with reasonable reliability but didn't do as well when it came to getting the chicks to fledgling stage.