In the autumn the monarch butterfly flies from Canada to Mexico, which is a distance of approximately 3,200 kilometres (2,000 miles).
Road kill
Road kill A group of researchers has published the results
of a study that shows that migration between local populations of
organisms is good for the health of the overall population of those
organisms. This important finding can be used where there are
issues over human activities, such as road building. When a new
road cuts through a population's territory, it cuts it off from
other populations and the migration that keeps the general
population healthy. The population which is isolated by the new
road will eventually decline. Previously, scientists believed that
local populations were separate and that migration between separate
populations did not occur. This new information can be used to
encourage road building practices which allow for migration of
wildlife populations across the road area. 26 SEPTEMBER 1998
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