Skunks
Skunks are synonymous with their stink and their smelly way of warding off danger. The creatures have two glands, one on each side of their anuses. These glands are responsible for producing a mixture of a sulfur-containing chemical that gives off a very offensive smell.
The fluid is so odorous that it can ward off bears and other potential attackers, and once sprayed, humans can smell it for a full mile. Experts say skunks typically try to avoid spraying because they only have so much fluid in reserve, and it can take ten days to produce more.