The Humboldt squid's "invasion" of California has been a sophisticated series of move and counter-move. They're here, then they're gone; they're big, then they're small.
I've explained--and Professor Gilly has explained in greater detail--how these animals have probably been reacting to environmental change. But if you'd rather watch a short video than have to read all that stuff, KGO-TV will oblige you:
Nifty Squid Vid
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