They also sense light through their skin: https://www.theguardian.com/science/neurophilosophy/2015/may/20/octopus-skin-contains-light-sensors https://www.thegu

They also sense light through their skin: https://www.theguardian.com/science/neurophilosophy/2015/may/20/octopus-skin-contains-light-sensors https://www.theguardian.com/science/neurophilosophy/2015/may... DOI 10.1242/jeb.110908