Food vlogger and TikTok user Maggie (@ maggieeatsss) has been hunting her white whale—the 10-pound Costco box of king crab legs—for years. Now she’s found it and is doing an unboxing reveal.

Hermit crabs have a curled tail with a hook that enables their bodies to fit inside these borrowed shells. Sometimes when a new shell turns up, hermit crabs will form a line, biggest to smallest ...