The Parque Estadual do Prosa (PEP), in Campo Grande, MS, is an urban fragment of savanna (cerrado) and tall savanna woodland (cerradão), with an area of 1,335 km(2), where the population density of brown-nosed coatis is 33.71 individuals/km(2). Our results suggest that seasonality at the PEP causes changes in the availability of resources for coatis, altering their home range areas, their dispe...

It was observed that when compared with indoor pigs, outdoor piglets spent significantly more time exploring and feeding and less time belly-nosing, showing oro-nasal or agonistic behaviour towards their pen mates. Belly-nosing and oro-nasal behaviours generally are considered aggressive rather than natural (Petersen, 1994). Höetzel et al. (2004) proposed that the decrease in unnatural behaviou...

Different types of dominance hierarchies reflect different social relationships in primates. In this study, we clarified the hierarchy and social relationships in a one-male unit of captive Rhinopithecus bieti observed between August 1998 and March 1999. Mean frequency of agonistic behaviour among adult females was 0.13 interactions per hour. Adult females exhibited a linear hierarchy with a re...

Agonistic behavior in Crocodylus porosus is well known the wild, but available data regarding this among captive individuals especially a farm setting rather limited. Studying aggressive of C. captivity important because obtained may contribute for conservation and safety handlers visitors. Thus, study focuses on to describe systematically agonistic behaviour relation feeding time, daytime or n...

Brain opioid systems have been implicated in the regulation of social interaction, including agonistic behaviour. kappa-Opioid receptor B and C mRNA levels were decreased in the ventral tegmental area but not in the nucleus accumbens in male mice with repeated experience of social victories (winners), but not in mice after social defeats (losers) after 10 but not 20 days of confrontations. mu-O...

Spinycheek crayfish ( Faxonius limosus ) and signal Pacifastacus leniusculus are successful North American invasive species distributed throughout Europe. Both compete with native benthic fish for shelter. In a laboratory approach, we assessed competition shelter antagonistic interactions between these the species, stone loach Barbatula barbatula bullhead Cottus gobio ). This allows studying po...