As stated in a previous chapter, all of the Indian tribes
occupying the region in the vicinity of the Yosemite Valley were
more or less affiliated by blood and intermarriage and resembled
each other in their customs, characteristics and religious
beliefs. What is said, therefore, on these subjects in the
following pages, will be understood to apply generally to all of
the tribes which have been mentioned as inhabiting this region,
although, of course, minor differences did exist, principally due
to environment. As in the case of all primitive peoples, their
mode of life, food supply, etc., were largely determined by
natural conditions, and the tribes living in the warm foot-hills
differed somewhat in these respects from those dwelling higher in
the mountains.