Now that there is some indication that the Alberta birds are starting to make their way back (and if one is, its reasonable to assume that all that are, are too) that makes it easier for the project to implement a course of action.
As for the ravens, this kind of thing happens in the wild too. Birds lose their nests all the time. Sometimes its a the nest stage like these birds, sometimes its actual eggs and/or chicks that are lost. If they should abandon nesting this year, it just means they will be in even better form for next year. I suspect, based on their tenacity to date, that they will nest somewhere. I'll be interested in how long they will stick with this site before moving along.
