Humans have been the only known species to domesticate other animals - until now. 
 
(picture credit:The Smithsonian’s Carrie Bow Cay Marine Research Station off the coast of Belize.Rohan Brooker)
 
In our new study, we describe what appears to be first example of a non-human vertebrate domesticating another animal...
...On the coral reefs off the coast of Belize, in Central America, longfin damselfish create, manage and feed from algae farms. We noticed they regularly have “swarms” of tiny crustaceans called mysid shrimps floating above their farms.
 
We found algae-farming fish that domesticate tiny shrimp to help run their farms | Australasian Science Magazine