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.
New results show that there are two sub-species of salmon lice. This fact may be vital to the development of new lice treatments for salmon, since different sub-species don’t necessarily react in the same way to medications.
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.