Bill writes:

>The  problem with this for humans is that, in almost all cultures with >which
I am familiar, it is considered a virtue to treat a single (and 
>maybe even a small number of) stranger(s) with respect and hospitality.
 Xenophobia is generally confined to large numbers of strangers, which
>would indicate that is based at least partly on territoriality and resource
>competition. Now even in the case of hospitality to strangers there is
>suspicion, possibly related to the  reasons you cite. But, at least in
>humans, the situation is more complex than the reasons you give 
>above. 

If migration between groups were as easy as you suggest, you're going to have a
difficult time explaining the evolution of the three primary language groups in
Nigeria, an area equivalent to the size of Texas, and the more than 400
distinct dialects and 250 ethnicities in such a small area.

For a language map of just southeastern Nigeria, please see:

  http://www.ethnologue.com/show_map.asp?name=Nigeria&seq=6

(my apologies in advance for the pop-up advertisements that accompany the page)

Wirt Atmar
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