Cleaner Wrasse Cleaning up a Big Fish

This tiny bluestreak cleaner wrasse looks pretty brave by swimming into that big potato cod's mouth, but don't worry. These two fish have a deal! The cleaner wrasse helps out bigger fish by eating any parasites and dead tissue that might be clinging to them. In exchange for the wrasse's assistance, the bigger fish refrain from snacking on them. The wrasse gets a free meal from the cod, and the cod stays healthier because of the wrasse. Relationships like this, where different plants or animals work togethe