pretty sure its to soon to sex, One is growing the tail out fast, the other very slow, these chicks are now 3 1/2 weeks old. both have been outside with mama since day 3 and all day and all evening. why is it they can be out there in the cold and when we buy chicks they need all that heat? I have not once seen mama have them under her during the day, just night time. and its cold here, windy and cold already. today is 44 degree's, soon to be below zero !