alligators
Dinosaurs were all reptiles and therefore, land dwellers. None of them could breathe underwater, although marine creatures that lived along side the dinosaurs have similarities to the dinosaurs, they weren't actually classed as dinosaurs. Therefore, no dinosaurs could breathe under the water :) EDIT Fish and some amphibians are the only vertebrates that have gills and can breath underwater. The same applies to ancient animals too.
Mostly other dinosaurs. However, there were some ferocious non-dinosaurs during the Mesozoic, such as giant crocodiles (e.g., Phobsuchus) which could have killed and eaten all but the very biggest dinos. Some of the great sea-lizards -- also non-dinosaurs -- during the period could have killed dinosaurs if they'd encountered them, but such combats would have been unlikely since each type of creature lived in a different habitat.
The "dinosaurs" that could fly, such as Pterodactyl, or swim, such as Elasmosaurus, weren't true dinosaurs. Therefore, they were prehistoric animals that were not dinosaurs.
If I could paint, I would primarily paint pictures of animals and dinosaurs.
Dinosaurs, ant eaters and a walrus
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.
The risk of animals that can't swim could drown. eg Bugs,
You mean Plesiosaurus? Oh, nope, it's not a dinosaur at all, no dinosaurs back then could swim...or fly. "Flying Dinosaurs" are actually a different group of prehistoric reptiles. Same goes for "Swimming Dinosaurs."
Dinosaurs were extinct before humans, but as some were meat eaters they could have eaten humans, and if they were around today, they could eat humans, like some animals do.
Dinosaurs could not not fly but pterosaurs lived during the dinosaurs age and they could fly. pterosaurs are not flying dinosaurs they are flying reptiles that lived at the same time as dinosaurs. Some examples of Pterosaurs are: Pterodon Pterodactlus Hopee this helpsss! from Megggannn
Yes they did Jesus created the universe and everything in it he did it in six days so animals could only go extict thanks pangs33 for being correct.
There were no true dinosaurs that could fly. But two flying creatures that lived during the dinosaur times were Pterodactyl and Ornithocheirus.