A parasite enters fish through gills and replaces their tongues. This isopod, Cymothoa exigua, attaches to the tongue stump and functions as a new tongue. Juvenile isopods mature as males and some ...

A new evolutionary theory suggests that some asexual parasites may temporarily be able to infect a wider range of hosts as harmful genetic mutations build up. Sexual reproduction helps organisms ...

A fox parasite that can spread to dogs and humans has made another appearance in the Pacific Northwest, researchers at Washington State University said Tuesday. Commonly known as the fox tapeworm, ...

For a blue mussel, a good meal does not come entirely without risk. Blue mussels feed by filtering microscopic algae from ...