Call them, rather, patterns of gratuitous behavior . For example, they play a lot. Animal play is a reasonably common phenomenon, at least among certain mammals, especially in the young of those species. The corvids, according to expert testimony, are irrepressibly playful. In fact, they show the most complex play known in birds.
Ravens play toss with themselves in the air, dropping and catching again a small twig.
Crows are equally frivolous. They play a brand of rugby, wherein one crow picks up a while pebble or a bit of shell and flies from tree to tree, taking a friendly bashing from its buddies until it drops the token. Such shameless hot-dogging is usually performed for a small audience of other crows. There is also an element of the practical jokester. This crow is a laff riot.