Top 10 Animal Workaholics

Cleaner Wrasse The many species of fish living in coral reefs have the cleaner wrasse to thank for living parasite-free. Similar to an aesthetician who scrubs the dead skin cells off a client's feet, the cleaner wrasse offers a similar scrub-down to its fellow aquatic creatures. These tiny fish average only 2 to 3 inches (5 to 7 centimeters) in length, but they spend all day, every day working to rid other reef fish of unwanted parasites and dead scales. They really get into the nitty-gritty of their job, cleaning fins, tails and even mouths. Surprisingly, they even clean much larger fish that might normally be considered predators. But the cleaner wrasse's job is deemed so important that, according to the Indianapolis Zoo, large fish are willing to forgo a snack in order to get a good cleaning. Of course, it's not completely selfless work for the cleaner wrasse, since all of those parasites are like a buffet for them. Reef fish get clean and the cleaners get a full belly, making this work arrangement a win-win.