In this undated photo, provided by Scott Groth, Groth, a diver, holds a sunflower sea star in waters off the Oregon coast near Port Orford, Ore., before the invasion of purple sea urchins. The sunflower sea star is the primary predator of the purple sea urchin and urchin numbers exploded when a mysterious wasting disease killed off millions of the sea stars beginning in 2013. Tens of millions of voracious purple sea urchins that have already chomped their way through towering underwater kelp forests in California are now spreading north to Oregon, sending the delicate marine ecosystem off the shore into such disarray that other critical species are starving to death. (Scott Groth via AP)
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