The Dufour's gland of plasterer bees protects their nests from water by secreting a natural polyester.

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"The plasterer bees (Colletes) and yellow-faced bees (Hylaeus) are among the most primitive bees; they build their breeding chambers in hollow twigs or holes in the ground, lining the walls of their nest cavity with wallpaper made of an oral secretion. This fluid hardens into a waterproof film resembling cellophane; the lining both prevents their collected nectar from leaking into the surrounding material and keeps away dampness and mold." (Pallasmaa 1995:37)

Animal ArchitectureApril 22, 2014
Ingo Arndt

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