On Fri, Oct 30, 2015 at 8:52 AM, Paul Stenquist <[email protected]> wrote: > When a sea urchin thinks what does it think about? I assume that it must be a > sentient being since it's an animal.
I don't think that a sea urchin is capable of thought, but who knows? Sea urchins have no true brain, but they are sensitive to touch, light, and chemicals. Although they do not have eyes, the entire body of sea urchins might function as a compound eye. Sea urchins feed mainly on algae, but can also feed on sea cucumbers and a wide range of invertebrates, such as mussels, sponges, brittle stars, and crinoids. So, they eat other animal life, and thus are fair game for us (and for sea otters, who love urchins). Dan Matyola http://www.pentaxphotogallery.com/danieljmatyola -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
