They're actually in the "core corvid" group, along with willy wagtails. As you'd expect, they're very smart. They hang out in extended family groups of about a dozen or so (hence the name!) and all of them help out to raise the baby of the main breeding pair. They're very playful, with their family, other birds, and humans and their pets. The ones that hang out at my place like playing with hoses, especially in the summer, and are smart enough to know that hoses only work when humans are nearby.
They live in the eastern parts of Australia, mostly inland. They prefer dry areas, partly because there is more competition in wetter areas. They eat seeds and bugs: bugs are more a summer food (wetter and hotter = more bugs), while seeds are more a winter/dry summer food.
Their main distinguishing characteristic is that they are VERY loud. They all chatter very loudly to one another as they play and look for food. They get one of their common names, CWA birds, from this. (The CWA is the Country Women's Club; so, basically, they sound like chattering old ladies. )
I am. I live in South-East/Central Queensland (though I moved to Brisbane to study). We see lots of apostlebirds, though we call them happy jacks. I love watching them playing. They're smart enough that they're always entertaining!