Nature's Answer to Meshing: How is it that honeybees (average brain size 1g) manage to outmesh those CFD engineers (average brain size 1250g) who still religiously rely on tetrahedral meshing? The answer is obviously not that bees are more intelligent than engineers (although there are a few notable exceptions). Whereas CFD and associated meshing technology has been around for just 40 years, bees benefit from several billion years of evolution.
From a purely evolutionary viewpoint, the hexagonal structure of the honeycomb is the endpoint of an exercise in energy optimization. The walls of each honey cell are fashioned from wax and are manufactured to a high tolerance (within 0.2% of their 100 micron thickness). Creating this wax costs energy that could be better‑used making honey to rear the next generation of bees.