Dont be too hard on yourself. My daughter brought home 2 chicks from school. After a few weeks I decided to put them (In a smaller cage) in the coop with the 4 bigger pullets. They were fine for a couple of weeks then I walked out one morning to a snake in the cage....one chick laying there dead....one had been eaten and the snake was too fat to crawl out. I felt terrible.....but you live you learn. that cage is not wrapped in window screen....nothing is getting in there with our babies anymore. the Babies we have in there now I am slowly trying to integrate into the coop with the bigger pullets......but my bigger pullets are bullies sooo we are taking it very slow