The emerald cockroach wasp (Ampulex compressa) relies on cockroaches for its grisly life cycle. The wasp's sting leaves the cockroach able to walk, but unable to initiate its own movement. It then administers another, more precise sting right into their victim's brain. The venom works to block a neurotransmitter called octopamine which is involved in preparations to execute complex behaviors such as walking.
The wasp then grabs the cockroach's antenna and leads it back to the nest. The cockroach walks "like a dog on a leash". Once home, the merciless wasp lays an egg on the docile cockroach's belly, and the larva, once hatched, devours the hapless insect.
http://www.nature.com/news/2007/071129/full/news.2007.312.html
http://en.wikipedia.org/wiki/Ampulex_compressa
Gruesome but cool video:
http://www.bgu.ac.il/life/Faculty/Libersat/movies/Wasp_movie_short.mpg
2007-11-30
03:02:16
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