Astonishing plant life animation (CGI). Pass me the napalm strimmer, I feel sick.

[youtube=http://www.youtube.com/watch?v=JUdpFN4O4B0&w=700]  

You would NOT want to find one of these bad boys at the bottom of your garden.

As the comments say, it's good, but if you want something a bit less organic (freaky) then check this out too.