The ability to return to a nest site directly is referred to as homing. See http://www.google.com/search?hl=en&lr=&client=safari&rls=en&defl=en&q=define:Homing&sa=X&oi=glossary_definition&ct=title for a definition of homing.

I. The Oedipus hypothesis puts the son in direct conflict with the father for the mother's reproductive potential. In most cases it is the son that is displaced by the father to prevent loss of the female reproductive resource. Males benefit from multiple females while females benefit from one male that will impregnate them.

J. Settlement in sub-optimal habitat will be governed by competition. As long as there are ideal habitats available they will be occupied first. It is only after all these ideal habitats are utilized that settlement in sub-optimal habitats begin. Therefore the factors involved include the number of displaced individuals and the number of ideal habitats available.

2. The resource benefits of territoriality includes procurement of a limited resource such as food, shelter or mates. A species may yet not be territorial even if resources are limited if the energetic investment in fighting for a territory is higher than the benefits gained from obtaining that territory or if competition levels are such that they would spend all their time defending and fighting without benefit.

The other requirement for territoriality is competition based on population density. If there is more consumers than resource territoriality often arises. Again even in a situation where population density is high there may not be territoriality exhibited if the benefits of territoriality do not out way the costs.

See http://people.eku.edu/ritchisong/birdterritories.html for a good review of territorial behavior and http://www.npwrc.usgs.gov/resource/birds/dickhab/intro.htm