The other day, I came across this post on my Facebook page describing the way hermit crabs exchange shells. Never having given hermit crabs any thought, I almost passed it up, but the bold text "ALL EXCHANGE SHELLS IN SEQUENCE SO EVERYONE GETS A NEW HOME" caught my eye. Like, what?
I was astounded to find out that hermit crabs who need new, bigger shells will line up in a queue, biggest to smallest. When a crab that fits the largest empty shell shows up, the others all move up one shell, leaving the smallest shell empty at the end of the line.