PLEASE HELP! We got our first chicks July 1st (2 sussex) and over the summer added on three blue coachens, two silkies, one polish and two black rock(?) all around the same age. They all are housed together and have a pen to run in. I believe we have one rooster for sure (blue coachen). About 4 wks ago, the smallest blue coachen was fine then died at night in the hen house. Then 2 wks ago our beautiful polish was found dying. Last night one of the sussex was found deceased as well. We have now lost 3. This is breaking our hearts, they have become pets to us and we love them. We are so new to this and wondering if we are doing something wrong. We live on Vancouver Island, it doesn't get too cold here but it has been chilly the past few nights. Do I need a heater in the hen house? How can I figure out what is going on with my chickens (none have laid eggs yet). Any and all advice would be appreciated as I don't know a lot of "chicken people". Thanks very much in advance.