Hi, I found this egg in my back yard about 9 days ago. I am pretty sure it is a goose egg. I candled it and it has been growing great, I have seen lots of movement up until yesterday where it seems so full I can only see a little bit of movement. I have no clue how old it is but it looks due to hatch soon. Yesterday these clear circles appeared in the air sac. I think they move a little when I move the egg. Any idea what it is? The egg is dirty so I apologize if it is hard to see. Thank you!!