Monarch butterfly migration, termite fortresses, and the fleeting life of a mayfly are just a few of the topics covered at this educational site from PBS. "Alien Empire" is the title of a recently aired program on insects, part of PBS's series Nature. The interactive Website presents short Flash animations on insect behavior and lifecycles, puzzles and activity ideas for kids, teacher resources, and video clips of bugs in action (Shockwave, QuickTime). Mac users be warned that a few animations won't be viewable, but the site is still worth a visit.