From the paper they produce themselves.
Wasps process dry plant stems and dead wood, preferring rotten or soft species such as aspen and linden. The shredded wood fibers, mixed with a special secretion, are transformed into a paper-like mass, from which wasps form the walls and internal partitions of their nests.
This wasp paper is highly durable and virtually resistant to moisture. However, wasps prefer to build their nests in rain-protected locations.
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