This Shrimp's Got Rhythm

[Link]: "In the new study, Becker's team observed the interactions between cleaner shrimp and various species of parasite-laden predatory fish in the wild. As potential customers approached, one or more shrimp moved toward the fish, shifting side-to-side in a dance the researchers suspect signals that the shrimp are available for cleaning: Every time a cleaner shrimp danced, it successfully lured a new customer"