I May have found a way around the birds

[Zee]

I'm not sure if this will work but try deleting the saved games were you missed a bird. when you push continue it should go back to your other checkpoint. has anyone tyred this?
edit: sorta works but it's hard to tell were you will end up.

[Maka]

Wtf!?!?!?1!

[SpideR NY]

yeah ima let you try that one buddy. :nana

[Zee]

It's kind of hard to explane. But if you go to comdemnd's save file and deleted the saves were you missed a bird you can deleted them and restart were you still get get them. try at your own risk tho. It's hard to tell what one's to delete.