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Each year, a few towns in [[California]] are greeted by the arrival of tens of thousands of monarch butterflies. Pacific Grove, California, is the peculiar destination of a huge quantity of such butterflies each year.
Each year, a few towns in [[California]] are greeted by the arrival of tens of thousands of monarch butterflies. Pacific Grove, California, is the peculiar destination of a huge quantity of such butterflies each year.
[[PBS]] provides a description of the phenomenon.<ref>http://www.pbs.org/wnet/nature/alienempire/voyagers.html</ref>
[[PBS]] provides a description of the phenomenon.<ref>https://www.pbs.org/wnet/nature/alienempire/voyagers.html</ref>
This report notes that one butterfly was tracked along a 1,870 mile route, from [[Ontario]] to [[Mexico]]. Its actual flight distance could easily have been two or even three times greater, because butterflies do not fly in straight lines.
This report notes that one butterfly was tracked along a 1,870 mile route, from [[Ontario]] to [[Mexico]]. Its actual flight distance could easily have been two or even three times greater, because butterflies do not fly in straight lines.