What you can see in this YouTube clip is very different from most of the underwater footage that you will come across online.

More than 950 species of sea urchins play a key role in reef ecosystems. As grazers, they naturally reduce algae cover and maintain the balance needed for coral to live in tropical waters.

This includes various groups of sea urchin, which by ste. advertisement. Sharks Go Absolutely Wild For Sea Urchins, ... pushing tropical waters and many species that inhabit them further south, ...

IT has long been known that certain littoral echinoids habitually cover the parts of their body that are exposed to light by fragments taken from their surroundings. Some have interpreted this as ...

Long-spined sea urchins are a crucial species in their shallow tropical environments, since they eat and keep algae populations in check that might otherwise threaten the survival of coral reefs.

A sea-borne pandemic that wiped out sea urchin populations in the Red Sea has spread and is taking out the species in parts of the Indian Ocean and could go global, scientists in Israel say.

The particular species of sea urchin affected is a well-known protector of coral reefs and the ... It seems to be heading east towards the tropical waters of the Coral Triangle that extends off ...