Here are our favourite hard-working creatures:
In the Navy
Bottle-nose dolphins and California sea lions are trained up to help the Navy in America.
Both species have top diving skills and super senses.
Sea lions are really good at seeing and hearing underwater.
The navy train the animals to dive deep into the water to find objects like sea mines.
Once they've found something the animals are moved from the area and the navy teams then move in to deal with it.
Dogs are often described as a 'man's best friend', and it's no surprise when you hear about the hero hounds that scale mountains, climb through rubble or risk their own paws to save people's lives.
Rescue teams from all over the world have specially trained dogs that they take with them to emergencies.
With their amazing sense of smell, dogs are very useful at sniffing out objects which makes them expert bomb detectors.
Theo the spaniel was awarded a top prize for saving the lives of soldiers in Afghanistan.
Dogs of course, are not just heroes in faraway places or in disaster zones they also help millions of people in their own homes.
Guide dogs are the most well-known for helping blind people, but more and more dogs are trained up to help people with other illnesses and needs.
According to American broadcasters, goats are being drafted in to get to work in some airports.
Why? Well, goats just love munching and airport bosses decided the animals would do a good job at clearing overgrown grasslands.
Airports in Chicago, San Francisco and Seattle have all used goat herds.