Long-spined sea urchins have emerged as an environmental ... In efforts to control urchin numbers, scientists have been ...

"Importantly, sharks easily handle very large sea urchins." Crested horn sharks (Heterodontus galeatus) accounted for 82 ...

Tourism could suffer a blow if the urchin invasion continues. The sea urchin (ikiriya in Sinhala) is a spiny, hard-shelled creature that lives on the rocky seafloor, usually in shallow waters. The ...

The spiky creatures - with defensive spines up to 50cm long - are familiar to scuba divers ... placing a dead black sea urchin - its body the size and shape of a flattened tennis ball - into ...