Tapeworms like many parasites are quite (IMO) fascinatining creatures. The adults are basically egg producing machines and these eggs pass out in the hosts (normally a carnivore) faeces. The eggs are then ingested by an intermediate host which is typically a snail and form a larvael stage. When the snail is then accidentally eaten by a rabbit the parasite migrates around the body forming the cysts which are tiny immature tapeworms. When the cyst is then consumed by a predator it then 'comes out' and attaches itself to the predators intestine and the process starts all over again. Well I think its fascinating! 