We had been getting an egg day once our girl first started on Sat Oct 1st. Then she skipped the next Thurs., egg on Friday. No egg on Sat, Sun or today! Then hubby found yolk on side of waterer inside house, then found a broken egg in yard and they both had yolk on their beaks and chest feathers....it was really sort of creepy! We only have one drake and one duck. Feeding an all flock crumbles, free choice oyster shell and grit. They forage in back yard all day. What does this mean?