Some tribal groups use traditional circumcision to mark the transition to manhood, others reject it.
Elders from each of the important tribal groups were asked to nominate their own MPs.
Later, the rival Naga tribal groups began a "counter blockade" on the same roads to protest against the demand.
There are at least 40 different tribal groups in Kenya - for the most part, they've gotten along well since independence more than 40 years ago.
The tensions between the Awakening movement, the U.S.-backed tribal groups that fought al Qaeda in Iraq, and the Iraqi Islamic Party had dominated attention in Anbar lately.
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So, for example, in Papua New Guinea, where I do my field work, the biggest single group among the thousand different tribal groups in Papua New Guinea numbers only 3 percent of the population.
The London-listed miner is accused of violating forest-protection laws and the rights of tribal groups, but has said it will not abandon the project, which was expected to yield 78m tonnes of the aluminium-bearing ore.
On the other hand, there was probably good reason to want to be able to place a stranger within the system of tribal groups, coalitions and alliances that early man would have had to deal with among his neighbours.
The American army has deployed anthropologists to help its troops understand the shifting mosaic of tribal interest groups.
In recent years, attention has shifted to providing unfettered ballot access and voting assistance to tribal and ethnic groups who are entitled to federal protections.
They are embedded in Punjab and links between them and groups in the tribal areas are erasing the distinctions between militant groups the state is willing to tolerate and those which it is fighting.
"These are not even firms in the old sense, but more tribal affiliations for specific groups of cases, " Richards says.
That is to say it's very hard to take a British or American citizen and put him into those groups because the groups are tribal.
In Nairobi's slums, which are often divided along tribal lines, rival groups have been fighting each other with machetes and sticks as police use tear gas and bullets to keep them from pouring into the city center.
Logan and team have written it up in a very elegant book, Tribal Leadership: Leveraging Natural Groups to Build a Thriving Organization, which they are giving away here as a free audiobook.
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Working hand in hand with first responders, state, local, tribal and territorial governments, community groups, international partners and the private sector, we have made great strides in protecting our nation from terrorism and other threats while building a culture of resiliency and preparedness in our communities.
As they do not have the tribal or militia protection afforded to the majority groups, they can do little to defend themselves.
Though there have been widespread peace efforts, rights groups remain concerned that the underlying issue of tribal rivalry still exists.
"It is a complex situation with multiple armed groups, " he said, describing the fighters as tribal militia.
Other groups seek to elicit sympathy by speaking on behalf of tribal forest-dwellers.
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You have to address their group interests, either as an ethno-religious community or as a clan or a tribal group, because they identify themselves in terms of one or more groups that they belong to.
"The growth of the memorial's tribal flag collection to more than 120 banners from American and Canadian tribes and groups indicates spreading popularity for Crazy Horse, " said Dobbs.
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The BBC's M Ilyas Khan in Islamabad points out that last week, people linked to one of those groups, Lashkar-e-Islam, were taken into custody by a government-backed tribal force.
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