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Banded Sea Urchin

Sea urchins are sea creatures that live in oceans all over the world. There are more than 700 different species of sea urchins.

Banded Sea Urchin

Banded Sea Urchin

They have a spherical shape which can range from about 3cm to 10 cm in diameter, and their bodies are covered with a spiny shell.

The skeleton of a sea urchin is known as the ‘test’. The shells within the test of these creatures are made up of packed, fitted plates which protect them from being damaged.  As for the spines outlining their shell, these are movable and help the sea urchin to camouflage or protect itself from predators.

Did you know?

Years ago the spines of sea urchins were collected from the beach and used as chalk to write on blackboards. In more recent times people are encouraged to leave shells and other remains from animals as it is an important calcium source for the ocean once they have dissolved.  

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