Underestimated Intelligence

Many across Aeternum believe those we call "Dryads" to be no more intelligent than an animal in the wild, living by pure instinct. How, then, do they create the weapons with which to defend themselves? They respond with examples of the shrike bird impaling its prey on sharp sticks. But while the shrike may indeed stab its prey on a point, it does not create the tool it uses, only what is found! Years of observation of these Dryads has led me to the conclusion that they are far more intelligent than others believe. I've not seen a Dryad create their weapon, but I see that they carry weapons of a variety of sizes and designs. I've never heard a Dryad communicate, but their behavior suggests that they must, in some form unknown to us.