We are having a bbq right now andabout 20 minutes ago A train went by and honked and my hen squatted and layed a shelless eggs,We laughed at first then I got worried, and just 5 mins ago another train went by and honked and another hen squatted and layed another shelless egg right in front of us, what causes this is this normal , they just started laying about a week and half ago and i have gotten regular eggs til just today what happened ,i feed them layena,the get to free range in the yard have grit clean water everything ,my other birds are fine did they justget startled, they grew up with the train sounds since chicks, there is about ten of us bbq and the EE;s were mingling with the guest any one have this happen?