In this photo, there are several species of popular freshwater aquarium dwarf shrimp.
I have had yellow shrimp and red cherry shrimp in my own aquariums. They are no more than one inch long at full adult size. Cute little scavengers that clean up the tanks nicely. They usually eat the algae growing on the aquatic plants and decorations, and they would eat any leftover fish food at the bottom of the tank.
Every good small fish community tank should have some of them. Bigger fish might eat them as snack. Small fish might still eat the baby shrimp, but it is a good population control measure for the shrimp, as well as good nutritious snack for the fish.