I have 4 black ameraucana chicks that are 4.5 weeks old. Any thoughts on determining the gender on these babes? One does seem to have slightly thicker legs and there seems a little more comb development but no distinct pinking or growth in the comb yet. I also note that there seems to be some difference in the shaping of the tail feathers. I am not familiar enough with this breed to tell. I do have a 6.5 week old blue wheaten that looks like it may be a pullet. No comb development and thin legs on it so far. Thanks for the insights!