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Because they are marine animals, sea urchins cannot survive in freshwater. They are widespread, from the sea's surface to its depths. The species that we'll probably work with in the lab are found in intertidal or shallow subtidal zones.

In public aquariums, sea urchins are utilized as indicator species to assess the system's health. Due to their high water sensitivity, this is. When the water is contaminated, sea urchins are one of the first to exhibit indications of stress, such as dropping & falling spines.

Additionally, they have been observed consuming carrion, sponges, sea stars, mussels, sea cucumbers, and polychaete worms. Using their mouths to grip and bite, sea urchins consume food.

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