How did Pterosaurs Learn to Fly? 

THIS ARTICLE discusses new evidence about the early days of reptile flight - and comes to no great conclusion.

Pterosaurs are the first reptiles to fly. They are not dinosaurs, although both are reptiles. 

The article discusses work done on fossils of Scleromochlus, now thought to be related to lagerpetids, which are a sister group of the pterosaurs. There is an article in NATURE (but paywalled) and HERE. The conclusion is that Scleromochlus is a pterosaur ancestor but the evidence for suitability for flight is absent. The conclusion reached is that the "first flying reptiles evolved from tiny, likely facultatively bipedal, cursorial ancestors".

The interest of the article is the amount of data that is now being found using CT scans. The fossils were found near Lossiemouth in Scotland in Late Triassic sandstone, more than 100 years ago. They have been much studied (by, among others, Mike Benton) but the conclusions reached were even less definitive.

Pterosaurs are not dinosaurs. Warpaint/Shutterstock