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Many studies have demonstrated that male aggression is regulated by testosterone. The conversion of testosterone to estradiol by brain aromatase is also known to regulate male aggression in the breeding season. Male song sparrows (Melospiza melodia morphna) are territorial not only in the breeding season, but also in the nonbreeding season, when plasma testosterone and estradiol levels are basal. Castration has no effect on nonbreeding aggression. In contrast, chronic (10 day) aromatase inhibitor (fadrozole) treatment decreases nonbreeding aggression, indicating a role for estrogens. Here, we show that acute (1 day) fadrozole treatment decreases nonbreeding territoriality, suggesting relatively rapid estrogen effects. In spring, fadrozole decreases brain aromatase activity, but acute and chronic fadrozole treatments do not significantly decrease aggression, although trends for some behaviors approach significance. In gonadally intact birds, fadrozole may be less effective at reducing aggression in the spring. This might occur because fadrozole causes a large increase in plasma testosterone in intact breeding males. Alternatively, estradiol may be more important for territoriality in winter than spring. We hypothesize that sex steroids regulate male aggression in spring and winter, but the endocrine mechanisms vary seasonally.

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Awareness and comprehension of the Queensland Police Service (QPS) caution was investigated in a group (N = 140) of university students in Queensland, Australia.Awareness was measured before participants were shown and read aloud the QPS caution; comprehension was then assessed. Participants also completed the Australian Legal Awareness Questionnaire (ALAQ) to ascertain their knowledge of legal matters more generally. The results show that participants were generally unaware of their legal rights and had difficulty comprehending the right to silence caution. Overall, the study demonstrates that while many of participants reported understanding the QPS caution, the reality is that most did not. This is a concerning outcome considering that people already marginalised by virtue of lower education and literacy levels (many Indigenous Australians residing in Far North Queensland, for example) are further seriously disadvantaged by failing to comprehend the police caution.