RAW #DnD question: Does a Druid have to know of/about the creature he wants to polymorph into? Ex. Dinosaur@mikemearlsYes, you have to have seen it before.
— Meg Joseph (@MissMoogle85) July 9, 2017
Correct!
— Mike Mearls (@mikemearls) July 9, 2017
Yes, but the dm has to determine what is reasonable. I think just about any animal or dire animal is reasonable for the druid to have come across during his normal life wandering the game world.
@mikemearls Does the Druid have to have seen a living version of the creature of can they just know about it from studying books?