From National Geographic
Fire Urchin, Indonesia
Photograph by Tim Laman
The spines of a fire urchin form a multicolored flower off Komodo Island, Indonesia. The blue swellings on the tip of each spine are filled with venom.
Pencil-Spined Urchin, Kingman Reef
Photograph by Brian J. Skerry
The spines of the omnivorous pencil-spined urchin extend outward from its body. There are some 700 species of sea urchins worldwide.
Sea Urchins, British Columbia
Photograph by Paul Nicklen
A nontoxic dye highlights water currents surrounding sea urchins off Vancouver Island, British Columbia. These small, spiny echinoderms are found in oceans all over the world.