The trematode has a complex life cycle that involves three host species, he said. In addition to the infectious stage in snails and the cyst stage in frogs, the parasites rely on predators including ...

Since the mid-1990s, scientists have been trying to figure out what has been causing frogs around the United States and Canada to become deformed. Little progress has been made in sorting out which ...

Deformities in Pennsylvania wood frogs are linked to the combination of their infection by parasites and a weakening of their immune system caused by exposure to pesticides, according to a study by ...

For decades, scientists have observed a clear pattern across the natural world: biodiversity tends to be higher near the equator and lower toward the poles. Known as the latitudinal diversity gradient ...