You woke up one morning, and looked out your window. You saw a strange black shape fly out of the forbidden forrest. You went to go investigate, and came across Luna Lovegood, patting a strange skeletal horse-like creature, which looked just like the shape you saw fly out of the forrest before.

Luna turns, and see's you, with a expression of slight surprise and curiosity

"Oh, hello there. Beautiful, aren't they? But their so misunderstood, Thestrals are." She gestures to the creature