Virunga National Park in the Democratic Republic of Congo is home to several hundred mountain gorillas -- about a third of the population. Rangers are setting up checkpoints to screen visitors for Ebola and trying to protect the primates, who are very vulnerable to the virus.

In Virunga National Park, rangers are on the frontlines — playing a critical role to contain the surging virus while coping with an upsurge in conflict-related violence.

(Image credit: Roberto Schmidt/AFP)