Hormonal Correlates of Dominance and Starvation‐induced Aggression in Chicks of the Blue‐footed Booby

In the blue‐footed booby ( Sula nebouxii ), the first‐hatched chick aggressively dominates its sibling and sometimes kills it when food is in short supply. To investigate the endocrine correlates of dominance‐subordinance and hunger‐induced agonism, we deprived 15–20‐d‐old single‐chick and two‐chick broods of food during 48 h by taping chicks' necks to prevent ingestion of parentally provided food (a protocol used previously and known to elicit...