"Interesting idea" During acorn shortages in winter, Dom (breeder) should show no preference on who he excludes, except birds from outside territory (i.e. he should allow his offspring access over others, but he should have prime access.) An old (dom?) raised on, territory over all but breeder, SHOULD preferential exclude from granaries during when acorn supplies limiting. Younger sibs should be allowed in [or] even unrelated subs) as long as there are enough acorns for dom breeders, himself, but only a couple more. Problems: Need correct demographic group, "proper" food shortage. Perhaps this is one reason earlier, exclusion from granaries. This effect would not happen in SJ, though, and argum circular IMP. Questions. How much more often do breed in natal territories then ? is difference as clear as in SJ, is or / mortality difference at adult-on-territory stage or young-bird-dispersing stage. Not likely due to nesting, as duties fairly well split up between sexes.