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Here we present evidence demonstrating that the corticosterone increase at the beginning of the dark period is causally linked to the increase in aggressiveness. We measured plasma corticosterone and quantified aggressive behaviour of male territorial rats at various time points of the day\u2013night transition. Low aggression levels were observed in the full light period when plasma concentrations of corticosterone were low. An increase in plasma corticosterone occurred just prior to the dark phase, when aggressive responding was the highest. Aggressive behaviour remained high in the early dark period when corticosterone was still high. 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