Illustration based on an article in Quanta Magazine titled, New Squid Genome Shines Light on Symbiotic Evolution, by Laura Poppick. The article talks about the bobtail squids' symbiotic relationship with a single bacteria, which has evolved to give the squid the ability to ‘glow’. This luminescence helps the squid camouflage with the reflection of the moon on the water and therefore protects it from predators.