Yes it does look like ring-necked parakeet which (under the old taxonomy) is native to Africa and Asia. It was recently split into 2 species so that these 2 groups are distinct. I'm not sure which this is without further work. Either way not a true blue occa aussie.Hi. Psittacula krameri. As far as I know these birds do not live there, so it must be an escapee. Try to catch the bird, if it is possible.
Those would be black vultures, yes. They aren't aggressive at all, they aren't dangerous. Vultures are known to projectile vomit when attacked while feeding, but unless you plan to run threateningly up to some black vultures while they're eating, that's not really a worry. They have to be fairly provoked to do that, too. I've seen people walk right by them, within ~5 feet, without getting any reaction beyond the vultures backing up a little. Yours may have stopped for a rest, or may have been eyeing something tempting on the ground below.
I like them. Some people find vultures ugly, but they're invaluable scavengers. Their stomachs are acidic enough to kill just about any pathogens they ingest, to the point where their droppings are sterile. This helps prevent the spread of disease, once a sick animal dies. If something is killed on a road near my house, I always make sure to (safely) move whatever it is off the road. Vultures can't take off terribly fast, so are vulnerable to being hit by cars if they try to scavenge something on the road. Not only is this typically fatal for the bird, it can be dangerous to the driver as well- a vulture's wingspan is more than enough to cover a windshield and prevent the driver seeing anything.