my 4 week old chicks....and also 2 ameracaunas that may be 5-6 weeks old?..i put them in the big girls brooder today..cause i also have 1 week old chicks..and i need to keep the temps higher for the younger ones, and because i noticed that the older ones were panting a bit when i had to turn on the heat light at night(havent had it on during the day..its been to hot here)...i put them in with the older ones today..and some of the older ones did go after them...then they stopped...then..they tried again..and it was only select few that went after them..my black sex link, my silver lakenvelder, and one ameracauna...they seem okay right now...a bit nervous..but okay...should i keep them in there overnight...or..do you think they will be killed...thanks, Wendy