We are new to chickens, started with 8 hybrid hens that were 7 weeks old. We've had them for 14 weeks now and they've grown into pretty, full sized hens. Laying has not started, but we eagerly await. Our hens are let out of their pen each afternoon to explore our residential sized yard. To our surprise, we awoke this morning to find our Golden Specklrd Hamburg dead at the bottom of the ladder in the pen. There was no sign of predator attack, or blood. She showed no signs of being unwell yesterday whatsoever. We are really disappointed and kids are upset. We'd really like to understand what may have been the cause, mostly because we'd like to avoid similar for our other hens.