I'm looking to do an analysis of powered flight vs. gliding in animals and how it ties into pterosaurs for an online class I'm working on, and I've been having issues finding appropriately leveled resources. I can find stuff about pterosaurs and I can find stuff about animal gliding and flight, but nothing comparing and contrasting them or that explains the mechanics in an accessible way. Online articles and videos would be ideal, physical resources/books are okay if I can find and scan them.