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You know, I never imagined there were he-dryads. Not even in an oak tree." One of the giants grinned at him. Druellae snorted. "Stupid! Where do you think acorns come from?

Terry Pratchett (2008). “The Colour Of Magic: (Discworld Novel 1)”, p.116, Random House
You know, I never imagined there were he-dryads. Not even in an oak tree. One of the giants grinned at him. Druellae snorted. Stupid! Where do you think acorns come from?