I tested what really happens when a fake foot steps on a sea urchin to see how dangerous the spines are and how they react ...

The entire body of a sea urchin is what researchers are now calling an “all-body brain,” with neurons that function as a ...

With spikes as long as knitting needles, long-spined sea urchins may look like underwater villains, but their appetite for algae makes them the unsung heroes of Caribbean reefs. Courtesy of the ...