The skink Trachylepis atlantica is endemic to the Fernando de Noronha archipelago. Although this species abundant in archipelago, it increasingly threatened by invasive species, predation, and anthropic interference. However, little known about its natural history. Here we report on territory use, male-male combat, mating behaviour of freeranging T. atlantica. During dry season, observed two bo...

We investigated the effects of the neurohypophysial peptide, arginine vasotocin (AVT), on the calling behavior of male Acris crepitans during and immediately following a simulated acoustic agonistic encounter. AVT did not block the aggressive response to agonistic calls, as the changes in temporal call characteristics in response to the encounter were similar to those of saline-treated males. H...

This study documented behaviour of cats during veterinary examinations investigating possible associations between their and age, gender, temperament, clinical parameters familiarity with pet carriers, car rides clinics. Background information (i.e. temperament clinics), signalment, were recorded for 95 a examination. Their was analysed behavioural profile attributed (alert, anxious, frightened...

The authors investigated implications of agonistic onset for anxiety and dispersive motivation in maturing wild house mouse males (Mus domesticus). Laboratory-kept fraternal pairs either developed agonistic dominance or stayed amicable during their first 2 months of life, when the authors assessed open-field behavior and dispersal propensity. State anxiety was lower in amicable than agonistic m...

Some authors have found indications of subgroup formation when domestic fowl are forced to live together in large flocks, while others have not. In this study experiments were carried out to test the hypothesis that hens in large flocks have home ranges in parts of the pen and that they form subgroups. We also studied if this is influenced by males. In a tiered aviary system (density averaged 1...

The Southern rock lobster, Jasusedwardsii, is a temperate species of spiny lobster with established well managed fisheries in Australia and New Zealand. It has also been under consideration as a species with aquaculture potential. Agonistic behaviour has important consequences under aquaculture conditions that encompass direct effects, such as damage or death of protagonists, and indirect effec...

Lesions in the archistriatum, the avian homologue of the amygdala, and the nucleus striae terminalis suppress the aggressive behaviour and enhance the avoidance behaviour of selected aggressive pigeons. Similar limbic circuits thus seem to control aggression in birds and mammals. It is well documented in mammals that the limbic system plays an important role in the control of aggression. For bi...

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