In this experiment you observed the polarisation changing properties of beetles. an obvious evolutionary motivation for this is secret signalling, but thits requires the same species to possess polarisation sensitive vision. has this beetle been shown to have such vision, and if so, how was this shown? what are some non-beetle examples of polarisation sensitive animal vision and what are the evolutionary benefits of this aside from secret signalling? there any animals that can detect animal more useful than ability to affect or discriminate linear polarisation? what is haidinger's brush? t affect polarisation?