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Thursday, April 14, 2005

Parasites Found

From viruses to tapeworms, barnacles to birds, parasites are among the most successful organisms on the planet, taking merciless advantage of every known creature. Take the tapeworm. This streamlined parasite is little more than gonads and a head full of hooks, having dispensed with a gut in favour of bathing in the nutrient-rich depths of its host's digestive system. In its average 18-year lifespan, a human tapeworm can generate 10 billion eggs.

Many parasites, such as the small liver fluke, have also mastered the art of manipulating their host's behaviour. Ants whose brains are infected with a juvenile fluke feel compelled to climb to the tops of grass blades, where they are more likely to be eaten by the fluke's ultimate host, a sheep.

Leafcutter ants use chopped-up leaves as a fertiliser for the fungus they grow in underground chambers. The ants cannot digest the leaves but the fungus that feeds on them produces a tasty meal of sugars and starch while breaking down the toxins in the leaves. And there is not an animal out there, including us, that can survive without the bacteria that live in its gut, digesting food and producing vitamins.

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