Oh my goodness this sounds just like my little chick Lucy! Her little vent is clear but any time she tries to poop it's like nothing happens---she strains & strains & you can see the little vent open up & poo there (or sometimes the poo just starts to come out but won't keep coming), but it doesn't come out. She cheeps madly every time & it breaks my heart. We've been trying the Olive Oil thing for a week now and it's not getting better. I think I'm going to try the yogurt today (and maybe the molasses? does anybody know--can I do that? can I do both or should I only do one or the other?) and I'm praying that will help. Please keep us updated on your little guy, what you try, what success you have, etc. Good luck! (Who would have ever thought we were WANTING a chicken to poo instead of complaining about how that's all they do?!)