In the shadows of Python Cave, Uganda, a leopard leaps from a guano mound—formed by bat excrement—and sinks its teeth into a ...

The Ebola virus disease outbreak now ravaging parts of West Africa is the largest on record. In fact, West Africa has seen more cases of the disease in 2014 than have been seen in all other ...

The deadly Ebola virus normally spreads among animals but occasionally spills over to humans, to dire effect. To understand how such diseases make that jump, scientists must find the animal host.