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Blog: sea urchins

Feather stars now on exhibit at the Seattle Aquarium

Feather stars now on exhibit at the Seattle Aquarium

Now’s your chance to cast your eyes upon the rarely seen and aptly named feather star. Visit our Puget Sound Fish exhibit to marvel over these graceful echinoderms—you may find it hard to believe they’re related to sea stars, sea cucumbers, sand dollars and sea urchins!

Ocean acidification and sea urchins

Ocean acidification and sea urchins

Like many other invertebrates, sea urchins may be vulnerable to increasing acid levels in the ocean. The hard parts of urchins (such as the sea urchin in our photo) are made up of calcite, magnesium-rich calcium carbonate.

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