Monarch butterflies spend the winter hibernating on trees in certain forests  Local environmental groups have organized tours of the forests in an effort to protect the butterflies' habitat against woodcutters  Unfortunately, the tourists trample most of the small shrubs that are necessary to the survival of any monarch butterflies that fall of the trees
Ttherefore, the tour groups themselves are endangering the monarch butterfly population
the amount of forest land suitable for monarch butterfly hibernation that is not currently used by monarch butterflies for hibernation