Rights: University of Waikato Published 17 September 2009 Download



They have things called red spots on the end of their arms, which basically can detect shades of intensity. So you know, if we were to move our hand over them, they would detect that the light had dropped and something was moving around.

Note: Red spots are also referred to as “eye spots”, they are located on the tips of their arms where their underside meets the top side.