Are animals that swim or fly Dinosaurs?

Dinosaurs were land dwellers, though some probably could swim it was not their main form of locomotion. However in the time of the dinosaurs there were also two classes of marine reptile that are now extinct. There where Icthyosaurs, which resembled dolphins, and PlesiOSaurs, which had paddles for limbs, but these were separate from dinosaurs.

As to flying, there were also flying reptiles during that time called pterosaurs. Again these were a group of animals separate from, but related to dinosaurs. However, one group of flying animals than many scientists now consider to be a branch of dinosaurs are the birds.