Poop gets its odor from bacteria ... can disrupt your digestive system and can cause stinky stool and diarrhea — though experts have yet to determine exactly why this happens.

The foul stench of penguin poop sets Antarctic krill on edge. In lab experiments, the mere scent of penguin droppings — or guano — sent krill scrambling for escape, researchers report March 20 in ...

Penguin poop is stinky but useful. In Antarctica, the birds’ nutrient-rich guano allows mosses and other organisms to flourish in an otherwise inhospitable place. And, since poop stains on the ice are ...