we don't know how... we thought the thing was completely sealed. we had closed and locked all doors last night. somehow a 7' snake got in and got two of our babies. they had just started going outside. i could kick myself for letting them stay out there. they were about 5-6 weeks old. they were fully feathered and it has been warm here. they were so happy to have all of the extra space. my fiance went into the coop this morning to feed/water and check on everyone. the snake had swallowed our RIR baby, had killed our Sebright, and was circling our Australorp bantam. he saved the australorp, but or TSC RIR and Sebright are gone. we're both just devastated. they were like our children. we're going to find the hole in the coop today.