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Reverted edits by Mark54 (Talk); changed back to last version by Philip J. Rayment
'''Migration''' is the movement of people or animals (particularly [[bird]]s) to live in another place.
With animals, migration is usually a periodic movement to better climate or feeding areas. It is typically repeated in a similar manner each year.
== Humans ==
Migration is typically done by individuals, families, or extended families goint to live in another [[country]], but there have been many periods of mass migration, where large numbers of people move to another country.
This is often instigated by oppressive regimes or [[natural disaster]]s, such as [[drought]].
== Animals ==
Animal migration presents an obvious puzzle: how do the creatures find their way to their destination?
Each year, a few towns in [[California]] are greeted by the arrival of tens of thousands of [[monarch butterfly|monarch butterflies]]. [[Pacific Grove]], California, is the peculiar destination of a huge quantity of such butterflies each year.
The [[PBS|Public Broadcasting Service]] provides a description of the phenomenon, without any possible explanation.<ref>http://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.
How do the [[butterfly|butterflies]] navigate themselves? This confounds purely materialistic explanation.
In [[Theory of evolution|evolutionary]] terms, butterflies are merely [[insect]]s far less developed than [[human]]s. But most humans could not even [[navigation|navigate]], unaided, 1,870 miles to a certain destination.
Simply recounting migration illustrates its wonder:"<ref>http://www.si.edu/resource/faq/nmnh/buginfo/monarch.htm</ref>
{{QuoteBox|There are 12 known pockets of [[forest]]s in Mexico where Monarchs gather for the winter. They have been seen in the [[Sierra Madre Mountains]] of Mexico by the tens of millions, and estimated at 4 million butterflies per acre. All wintering sites are about 9,000 feet in elevation, generally cold with [[frost]]s at times. ... The majority of Monarchs from the east side of the [[Rocky Mountains]] overwinter in Mexico, but those from west of the Rockies overwinter in groves of [[Monterey pines]] or [[eucalyptus]] trees at sites along the California coast, from [[San Francisco]] to [[Los Angeles]].}}
Even more remarkable is how many butterflies die during the migration, and yet their offspring continue on the same journey nevertheless.
===References===
<References/>
[[category:zoology]]