Beneath sea urchins’ exterior spines, rounded skeletons called tests are jewels of color, texture, and symmetry. There are hundreds of urchin species, and they’re found in every ocean on Earth ...

As coral reefs struggle to adapt to warming waters, high levels of pollution and sea-level rise, ballooning sea-urchin populations are threatening to push some reefs in Hawaii past the point of ...

Hōnaunau Bay, Hawaii on 25 January, 2020. Sea urchin populations are ballooning in the bay, putting the coral reef at risk, a new study has found.

A sharp decline in the catch of sea urchin has made the spiny delicacy further out of reach for many consumers already ...