Missing link found on sharks On any visit to a rocky seashore, you are likely to spot barnacles, unoffendingly stuck to hard surfaces. But barnacles in a fjord in Norway have become parasites that eat fish through feeding stems.
Primitive worms threaten harvests They live in the soil, are numerous, and can be microscopic. Yet nematodes can effectively kill off fruit trees and cereals.
Beware the bite of the warble fly Reindeer aren't the only animals to suffer from attacks by the warble fly -- the insect will attack humans, too. The flies leave behind an unwelcome gift of eggs that mature under the skin and that in the worst cases can cause blindness.