Purple Sea Urchin

Scientific Name: Strongylocentrotus purpuratus
Range: Alaska to Cedros Island, Mexico
Habitat: Kelp forest and rocky intertidal areas 
Diet: Algae 
Size: 3 in (7.5 cm)
Fun Fact: Often decorate themselves with rocks and bits of shells to avoid predation and desiccation. 
IUCN Conservation Status: Unknown