I've not had this before in a bird so young. It is a mixed bunch of Texas AM, Goldens, and Pharo, and this is a larger Texas AM but all are the same age. This chick which is only two weeks old is making the threatening noise preceding an attack, then chasing the other chicks away from the food or water. I've not had this before and would like to separate, but I've only got one brooder with a heat source. The bird is fully feathered, apart from its head which still has baby fluff, the rest of the chicks are partially feathered. Is it too soon to remove from heat? Not sure what to do! Any help much appreciated.