Sea Urchins

  Fun Facts: There are over 200 species of sea urchins Some sea urchins contain venom Sea urchins are omnivores, eating both plants and animals The bodies of sea urchins have radial symmetry, meaning they can be divided into 5 equal parts Sea urchins reproduce by external fertilization When the eggs hatch, the urchin is in a larval stage, and swim with other tiny sea creatures that make up zooplankton Average life span of most species is 30 years Sea urchins have teeth, which they can use to scrape algae off of surfaces.  They can also use their teeth to excavate a hole in coral and rock in order to hide