Given the costs, why do animals disperse from their natal territory?
Overcrowding, competition, and/or a depletion of resources (such as food) in their birth (natal) territory.
What is Philopatry?
The behaviour of remaining in, or returning to, an individual's birthplace
Species that return to their birthplace in order to breed are said to exhibit natal philopatry.
What is the function of “social dispersal”?
Social dispersal reduces the occurrence of inbreeding; ex: Cheetahs and white-footed mice
What trend in social dispersal is observed among birds and mammals?
In birds, it is typical for the males to remain in their natal territory and maintain a "territory" in which they will try to attract female mates via song. In mammals, it is typical for the females to remain in their native location so that they can take advantage of relatives as aids to help raise the offspring and to take advantage of known resources in the area. Male mammals typically disperse in an attempt to find mates.
What were the findings on a recent study of difference between colonizers and non-colonizers in butterflies?
There is a genetic component in butterflies that enables some to more easily disperse and be successful in some place other than their natal area. The butterflies that have the genetics that allow them to be more successful when dispersing are often more efficient at flying and reproduce quicker than butterflies that are philopatric.