Found 2 baby twin sandhill cranes and need these question answered!!!?

Me and my sister found 2 twin baby sandhill cranes today they looked about a week or so old. Where they came from was a field that got tilde yesterday so we are guessing there habitat got ruined and they got separated from there mother. We were going to just leave them be but we got scared cause we have a lot of big dogs around the neighbor hood so we decided to catch them (with care of course) and call a wildlife center. They told us to bring them in so we drove 30 miles in rush hour traffic to bring them in and when we got there they asked us if we could possibly bring them back if there are still cranes around (we heard only one when we got the babies so it was a 50/50 chance) so doing anything for these babies we decided to bring them back and let them go where they came from and just hope for the best!! We are going to check on them tomorrow and see if they made it or not ( i sure hope they make it and are okay) but my main question is what are some reasons that baby sandhill cranes leave there mothers and run around?? Do you think we did the right thing about bringing them back or should we have left them at the wildlife center?? I only want whats best for those cute little birds!!! If i could i would of done anything to raise them my own but i would go sooooo broke if i did. So someone ease my mind and answer my questions