My fil's dog has been going across the road and taking chicks about 4/5 weeks old I assume based on my 6 week old. He killed two of them and the last two he got he brought back and left. I cannot see any visiable injuries although they arrived after dark and I'm not a chicken indoors kinda gal. Since I had just put my chicks in the coop from the brooder yesterday I figured I"d put the two new ones in the brooder that is now empty. They are in a huge space and there is only two of them. I don't have a lamp for them. Do they need one still at that age? Also do my 6 week old's still need one? It gets to about 8 degrees celcius at night here. My husband would love to not have it plugged in anymore. Thanks all.