> The mayfly squid’s ultra-sophisticated control over its coloration and patterns might seem inexplicable given the often limited visibility available to it. Ho

> The mayfly squid’s ultra-sophisticated control over its coloration and patterns might seem inexplicable given the often limited visibility available to it. However, if the mayfly squid’s third eye does detect bioluminescence, then the evolutionary advantage of such control becomes apparent: even in the high silt conditions of the Amazon (or some of Florida’s more polluted rivers), it can remain in communication with other squid, using what amounts to a form of cryptography. Fascinating