A Raven chortle with a percussive flair.
A Raven bark with a little bit of aquatic color to it like when you bump a metal container with liquid in it on the corner of an espresso machine.
Very unobtrusive, best for text tones and other alerts that happen often and you don't want to annoy your friends who are into the movie that's playing.
This one will get your attention! Or you'll be walking through the woods and you'll hear a real-life raven and think you got an alert on your phone.