Nematocysts Firing Cells on the tentacles of jellyfish each shoot out a poisoned harpoon when a trigger hair is disturbed. This reaction is the fastest cellular process in the natural world. Open in... A new window This window This frame

Pedicel Usage A sea urchin uses its pedicels to maneouver an urchin cookie to its mouth. With happenstance commentary from the caretaker. Open in... A new window This window This frame

Pedicels Up Close Sea Urchins of the island of Sulawesi display their pedicels clearly. Open in... A new window This window This frame

Sea Urchin flipping with spines The urchin's test is adorned with a plethora of articulate spines, not only making the urchin a pain to eat, but giving it some helpful abilities. Open in... A new window This window This frame