quiet-the-power-of-introverts-in-a-world-that-cant-stop-talking-susan-cain

a diversity of personalities maintained
by natural selection.”
Another example of the trade-off theory
of evolution is a species known as
Trinidadian guppies. These guppies develop
personalities—with astonishing
speed, in evolutionary terms—to suit
the microclimates in which they live.
Their natural predators are pike. But
some guppy neighborhoods, upstream
of a waterfall for example, are pikefree.
If you’re a guppy who grew up in
such a charmed locale, then chances
are you have a bold and carefree personality
well suited to la dolce vita. In
contrast, if your guppy family came
from a “bad neighborhood” downstream
from the waterfall, where pike
cruise the waterways menacingly, then
you probably have a much more circumspect
style, just right for avoiding
the bad guys.
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