Seems like a stupid question, but from what I could gather aves (birds) are therapods, a kind of dinosaur, and dinosaurs are part of the class reptilia. So are birds reptiles? Are dinosaurs reptiles and are birds dinosaurs? I've tried figuring this out by myself, but sometimes aves is a subgroup of dinosauria, sometimes it is a class in its own right. Moreover, I've read that crocs are closer to birds than to lizards (o_0) Can the taxonomically savvy forumers help?