i don't think so, Moon Cat.
This authorative page fails to even mention the
idea of mass suicide, despite having a section on
"Causes of death":
http://www.cws-scf.ec.gc.ca/hww-fap/hww-fap.cfm?ID_species=61&lang=e
According to biologist David Bauman:
"When they migrate, however, many do drown
while crossing rivers and lakes," he adds. It is
this that gave rise to the myths associated with
lemmings.
From:
http://www.advance.uconn.edu/00061214.htm
And is supect the film you saw was a 1958 Disney
documentary called "White Wilderness". Rather
worryingly, the following has been alleged about
that film:
"during the filming of a 1958 Disney documentary,
White Wilderness, the film crew imported lemmings
into Alberta, Canada, (not a natural habitat for the
animals) then herded a group of a few dozen
lemmings over a cliff and into the water in order to
stage a mass migration and demonstrate their
reported suicidal behavior. While Disney didn't
fabricate this scientific myth, the film certainly
helped fuel the misconception that lemmings
commit group suicide when their population level
is too high."
http://ask.yahoo.com/ask/20010725.html
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