Each arm has a short sensory tentacle at its end that responds to chemicals and vibrations in the water, and a red photosensitive eyespot. A sea star often lifts the end of an arm to perceive light and movement.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.
About Infoplease, Part of Family Education Network
© 2000–2014 Pearson Education, publishing as Infoplease