Where do purple sea urchins live in nature?

Purple sea urchins (Strongylocentrotus purpuratus) are found along the Pacific coast of North America, from Alaska to Baja California.

They prefer rocky intertidal and subtidal zones, typically found in areas with moderate wave action and good water circulation. They can be found in a variety of habitats, including:

* Rocky reefs: These are their preferred habitat, offering a stable substrate for attachment and access to food.

* Kelp forests: They are often found associated with kelp, grazing on the algae and contributing to the ecosystem's balance.

* Tide pools: They can tolerate short periods of exposure to air and can be found in tide pools during low tide.

It's important to note that while their range is extensive, they aren't found uniformly throughout the entire coastline. Distribution can vary depending on local environmental conditions and specific habitat availability.