As
this map shows, there are two main monarch populations
in North America. (A population is a group of organisms
of the same species that occupies a particular space at a particular
time.)
The
Rocky Mountains provide a barrier for complete intermixing of North
America's two populations. (Recent tagging studies have shown that
there is some mixing between the eastern and western populations.)
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Distribution
Map
This
map is called a "distribution" map. It shows where monarch
butterflies live and migrate in North America.
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