The Saraswati Anemone Shrimp makes its home on a sea anemone (the purple and green). Fish allow this

The Saraswati Anemone Shrimp makes its home on a sea anemone (the purple and green). Fish allow this 1-cm long “cleaner shrimp” to crawl all over them, including inside their mouths and gills, in order to eat tiny unwanted parasites off of the much larger animals. 

Since they play such an important role in the health of the reef ecosystem, most if not all other animals just let them do their jobs and don’t try to eat them.

If you look closely you can see right through this shrimp’s exoskeleton and notice the clutch of eggs it’s carrying - photo taken at Kri Island, Raja Ampat, Indonesia