Sea Urchin
Alternative names: Sea Hedgehogs, Echinoidea
The Sea Urchin is a globular animal which is found across the ocean floors worldwide, but rarely in the colder, polar regions. There are around 200 species of sea urchin in the ocean, which come in all shapes and sizes. Some sea urchins are covered in long spines, while others have a hard shell that is made up of chalky plates. Also, their spines can be venomous or cause infection, depending on the species.
In the present, the sea urchin population is declining due to the dredging of the ocean's floor and pollution and are threatened with extinction.