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Hi. My name is***** I'm sorry to hear about this outcome. It is tough in nature. If the actual nest itself wasn't physically disturbed, it tipped or shifted, then the blame goes toward a bird. I've seen nests shift due to being built in areas where they can't be secured well. Could wind have shifted it and tipped them out? As far as birds doing this, could mom have been in the next and been shifting around and bumped them out? Could the nest just not have high enough sides to keep them from being accidentally pushed out or on their own falling out? Could another male have come in and pushed them out? I would be curious to see if the nest is used again by the same female here.