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Dehydroepiandrosterone (DHEA) administration increases aggression in male song sparrows. Nonbreeding male songs sparrows, held under short days (8L : 16D) implanted with DHEA‐filled silastic implants for 14 days showed higher total aggression scores and a shorter latency to show an aggressive behaviour than birds with empty implants. DHEA, n = 6; Control, n = 6. Asterisks denote significant differences at P ≤ 0.05.
