A Burmese python coils around the arm of a hunter during a news conference in 2010 in the Florida Everglades. New research suggests that the pythons won't spread through the American Southeast, as previously believed. Lynne Sladky/AP hide caption

itoggle caption Lynne Sladky/AP

Some 3,000 wild boars are estimated to roam Germany's capital. This 2008 picture provided by the Berlin Forestry Commission shows a sow and her offspring that decided to make their home outside an apartment building. Recently, a wild boar attacked and injured four people in a Berlin neighborhood. Thorsten Wiehle/Berlin Forestry Commission hide caption

itoggle caption Thorsten Wiehle/Berlin Forestry Commission