Tapeworms
Tapeworms live in the digestive tract of vertebrates as adults, and in varoius animals as juveniles.All species of vertebrate can parasitised by one species of tapeworm. Tape wroms are able to grow up to 65 feet, and the whale tapewrom may grow up to 100 feet. They have been around for a long time as they have been discovered in the feces of ancinet animals.