Answer:
Nomads (hunter-gatherers).
Step-by-step explanation:
Nomads are a group of people or a community that moves from one place to another without a specific place of settlement. They move as and when necessary, carrying all their livestock and belongings, and with no solid housing.
In the given passage from Paul Spencer's "The Samburu", their lifestyle of "moving" from one settlement to another, carrying all their things is an example of such people. They are also known as hunter-gatherers, relying on the place they decide to stay for the moment, and then moving on to the next.
Thus, the correct answer is nomads (hunter-gatherers).