This story was produced in collaboration with The Dodo.

One morning this week, Hanna Koch was snorkeling in the Florida Keys when she came across a brown beer bottle on the sea floor. Koch, a marine biologist for Florida’s Monroe County, picked up the bottle, planning to carry it with her and later toss it out.

Through her dive mask, Koch peered inside to make sure it was empty.

That’s when she saw an eyeball.

“There was something staring back at me,” Koch told me.

It wasn’t just one eyeball, actually — but dozens. Inside the bottle was an octopus mom with a brood of........

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