Nyctosaurus

Here's another pterosaur, the weird-looking, but undeniably awesome Nyctosaurus gracilis. Its head sported a strange antler-like crest that some believe supported a sail. This one's guarding itself against the rain inside a warm and comfy cave.
Nyctosaurus ("Night lizard") was discovered rather early, at the end of the 19th century, but it wasn't up until recently that its strange crest was suggested to have supported a sail, much like a flying windsurf board. It was almost as big as its much more famous relative, the Pteranodon, reaching up to 7 metres of wingspan.