I searched "thunderstorm" and didn't find any forum discussion about this problem. My flock numbers around 30, 2-month-old mostly pullets in a large (500 sq. ft.) stationery house. The house is divided into four rooms with multiple perches and feeding/watering stations. Even though the weather is warm, I still leave one heat lamp on in case any of the birds feel chilled. Last week thunderstorms rolled through our area. The morning after a big storm I found four dead pullets piled in one corner of the house. The one on bottom was pretty flattened. I theorized the entire flock had huddled together out of fear and those in the corner were crushed. I was puzzled about their choice of location. Instead of being along the most protected back wall of the house, these birds were in the outermost corner least sheltered from the elements in the part of the house I refer to as the ‘sunporch’. Two days went by without incident then along came another thunderstorm. The next morning, another flat chicken in that same corner. I hear rumbling off in the distance. What can I do to prevent this from happening again?