This video says about itself:
A Tale of Two Urchins | CreatureCast | The New York Times
26 February 2014
Many different species do similar things. The pencil sea urchin and green sea urchin, for example, are both grazers in the coastal waters of the Galapagos Islands. Read the story here.
Pingback: Sea urchin video | Dear Kitty. Some blog
Pingback: Rare tortoise babies born on Galapagos island | Dear Kitty. Some blog
Pingback: Sea urchins seeing with their feet | Dear Kitty. Some blog