This photo is from the Facebook page of the Lake Erie Nature & Science Center.
When bees build their comb, they work in teams.
The bees have hooks on the end of their legs and they link them together
to form what's considered to be a "natural" scaffolding to work around the nest.
This additional photo by Brandon Dill shows another unique view of bees linking or "festooning".
More information is available here at The Peace Bee Farmer.