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Dwarf mongooses in the Taru desert region of Kenya form foraging communities with a variety of endemic bird species, especially hornbills. The prey spectra of the mongooses and hornbills overlap almost completely. For the other bird species forming the foraging community only partial overlap...
The data on the frequency of mating by queens of eusocial Hymenoptera are reviewed.
Pheidole desertorum and P. hyatti use rapid nest evacuation to defend against raids by the army ant Neivamyrmex nigrescens Cresson. The general organization of the defense is similar in both Pheidole species.
Certain carpenter bees (Xylocopa) are characterized by cohabitation of several females in partly common nest structures and/or by the meeting, inside the nest, between adult offspring and their mother. Both conditions are considered to be a basis for social life in bees.
Data on reproductive activity in one group of free-ranging Macaca mulatta were analysed in an attempt to assess the explanatory power of male dominance for mate selection when male reproductive performance is weighted in relation to the likelihood of ovulation and conception. In the present...
Micro-and macroevolutionary effects of social group fission will be enhanced if genetic differentiation between fission products is greater than expected by randomly dividing a parent group. There is evidence that division along lines of maternal relatedness produces such an enhanced effect in...
Aggressive behavior of two morphologically and ecologically similar sympatric congeners, Peromyscus leucopus noveboracensis and P. maniculatus nubiterrae, was studied in the field to determine whether coexistence between these two species could be mediated by interspecific territoriality.
Variations in the begging behaviour of the nestlings of altricial birds can provide the parents with information about the nestlings' nutritional needs and thus influence the parental feeding rate. In a series of four experiments, the stimulus situation encountered by great tits on their feeding...
The proportion of a honeybee colony's foragers which locate forage patches by independent scouting, as opposed to following recruitment dances, varies between about 5 and 35%, depending on forage availability. Experienced foragers scout more than do novice foragers. The cost of finding a forage...
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