AD Header Dropdowns  AD Main Menu  Nastiest invasive species
across America   Invasive species are among us, and they're
likely here to stay. These invaders from foreign lands alight on
new soil and decide they'd like to set up housekeeping, often
wreaking havoc on the local ecosystem, and costing millions in
property and habitat destruction to beleaguered human
bystanders.   "When people move either by accident or on purpose
certain plants, animals, or microorganisms to places where they
are not part of nature they invade and cause great harm," Chris
Dionigi, Deputy Director of the National Invasive Species
Council, told GlobalPost.  Here's some of the most loathsome
offenders.   1. Burmese python  The massive Burmese python is
perhaps the most menacing invasive species in America, as one
might expect from a gigantic, aggressive Southeast Asian snake.
It's not entirely clear how these beasts first made it to
Florida — zoo escapees from hurricanes and lousy pet owners are
likely culprits — but the reptiles so