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Although well documented in social insects, the possibility of behavioral differentiation during collective building has been poorly studied in mammals. In this context, the mound-building mouse Mus spicilegus is an interesting model. Under natural conditions, juveniles from different litters gather vegetal material and build a sophisticated structure, the(More)
Spermophilus spilosoma and Spermophilus mexicanus are closely related species with a low degree of sociality. They are sympatric in the Bolson de Mapimi (Chihuahua Desert, Mexico), where they occupy similar ecological niches. In Sciurid rodents, advanced social structures may have evolved through the formation of sedentary female groups. The purpose of this(More)
Ctenodactylus gundi, a colonial rodent inhabiting saharian Atlas, is often seen standing at the top of the rocks. At more or less regular intervals, another conspecific is taking the place of the "resident" animal. This relief impues only amicable reliationships and is to be considered as a kind of cooperation. The function of the resident, as a specific(More)
Spermophilus tridecemlineatus is a ground squirrel living in North America. At the end of hibernation males start searching for oestrous females. During this scramble competition polygyny, overt conflicts between males may appear. Six dyadic encounters between unfamiliar males were held in the laboratory during the reproductive season. These encounters were(More)
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