Aspects of this topic are discussed in the following places at Britannica.
...Bontoc, southern Kalinga, Tinggian) nearly all live in populous villages, but one ethnic unit (the Ifugao) has small farmsteads of kinsmen dotted throughout the rice terraces. The second group (the Gaddang, northern Kalinga, and Isneg or Apayao) are sparsely settled in hamlets or farmsteads around which new gardens are cleared as the soil is worked out; some Gaddang live in tree houses.
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