Following chronic testosterone (T) administration, young chicks crow regularly and become very aggressive towards conspecifics. Since T follows two metabolic pathways, aromatization to estradiol (EB) and reduction to dihydrotestosterone (DHT), we investigated the effects of administration of these hormones on social behavior in young domestic chicks. Chicks were obtained at one day post hatch, housed in like-treated flocks, and administered either 2.5mg T, 2.5mg EB, 2.5mg DHT, 2.5mg of both DHT & EB, or oil vehicle control. Animals in the various experimental conditions did not differ from each other in either body weight or testes weight. When isolated, DHT-treated chicks emitted slightly fewer distress calls than the other chicks, but significantly more calls of other types. When animals were observed in their home cages, T-treated animals were significantly more aggressive than the other groups. While they displayed no aggression towards their flockmates, the EB-treated chicks directed more aggressive acts towards the experimenters' hands when they were systematically placed within the cages. Both the T and EB/DHT animals emitted crows, while neither the EB, DHT, or Veh chicks ever did. When tested on a social approach task, where a separated animal had to move to rejoin the flock, there were no differences between the groups. In summary, while testosterone treatment induces many adult-like patterns of behavior in young chicks, which of those are modulated by each of the separate metabolic pathways will require additional testing.