Abstract
In many species, groups form when some young animals remain with their familiesl~~l% However, not all sedentary offspring eventually inherit their natal area. Individual ‘decisions’ about whether to remain within (philopatry), OI to move away (disperse) from, one’s natal area or group are extremely complex. For example, the probabiiity of an individual staying put or emigrating may be greatly influenced by: (1) the composition of its natal group; (2) the behavior of all other group members, especially with respect to involuntary departure as a result of parent-offspring or sibling conflict; and (3) local environmental conditions. Also, the survival and reproductive fitness of every group member can be strongly affected by another animal’s decision about moving. For example, competition for food, successful defense of a group’s territory and offspring survival may ail bc: related to group Size.14
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