Behavioural interactions and habitat use by larvae of the giant damselfly, Megaloprepus coerulatus, were studied in Panama. These larvae live in water-filled holes in fallen and living trees. Despite potential advantages for larval territoriality in this species, M. coerulatus did not exhibit exclusive use of resources, probably because their prey were not spatially clumped. Both well-fed and s...

During focal observations carried out in the Olho d’Água River, upper Paraguay River basin, Brazil, we registered defensive behaviour of one pair Crenicichla lepidota attempting to protect their offspring from conspecific and non-specific predators. Adults exhibited substrate-guarding displayed primary secondary anti-predation mechanisms. The mechanisms (e.g., fin flicking flaring, gill extendi...

One type of social behavior--agonistic behavior--is commonly observed among food animals. Agonistic behaviors are those behaviors which cause, threaten to cause or seek to reduce physical damage. Agonistic behavior is comprised of threats, aggression and submission. While any one of these divisions of agonistic behavior may be observed alone, they usually are found, in sequence, from the start ...

In comparison to studies investigating the roles of 5-HT1, 5-HT2 and 5-HT3 receptors in aggressive behaviour there is a dearth of material examining the function of 5-HT4 receptors in this behaviour. In view of this, the current study examined the effects of the 5-HT4 receptor partial agonist RS 67333 and antagonist RS 39604 in murine agonistic behaviour. RS 67333 failed to produce any signific...

Social agonistic behaviour of intact male rats is strongly reduced by the experience of defeat by a dominant male conspecific. Small electrolytic lesions in the corticomedial amygdala strongly affected this behavioural change due to defeat. No effects of the lesions were observed before and during the defeat. Some learning is still possible in corticomedial amygdala lesioned animals. A comparis...

Objects and semiochemicals may be used as enrichment in zoos. Domestic cats release Fraction 3 of Facial Pheromone (F3) by rubbing the muzzle to convey relational territorial information. We aimed evaluate whether how introduction novel objects scent stimuli could change behaviour one group (N = 5 subjects) adult European wildcats (Felis silvestris silvestris) hosted at Parco Natura Viva-Garda ...

The changes in broiler behaviour are reliable indicators of their health status. The aim of the present study was to follow the behavioural changes of broiler chickens after induction and treatment of muscular dystrophy. The study was performed on 20 broiler chickens, reared under comfortable microclimatic conditions. The birds were divided into two groups: group I (control group) and group II ...

Postconflict affiliation has been mostly studied in Old World primates, and we still lack comparative research to understand completely the functional value of reconciliation. Cebus species display great variability in social characteristics, thereby providing a great opportunity for comparative studies. We recorded 190 agonistic interactions and subsequent postconflict behaviour in a captive g...