Through evolution, the rich diversity of life has created animals that have ... enough nutrition from the plant matter they ingest. To compensate, they eat their poop after its first trip through ...

Scientists from the University of California, San Francisco, sampled ice cores from the region, in which they discovered an ancient virus in the frozen caribou feces. The virus ... are still ...

Eating poop might seem repulsive to humans, but in the animal kingdom ... where bacteria ferment tough plant materials.