Cats do this, too. Late at night, a buddy of mine happened on a bunch of cats sitting in a circle, taking turns meowing at each other. He froze and watched it for a little while, and after a few meows, they all whipped around to look at him when they became aware of him, and then they all scattered in all directions.
What were they up to? Why did a human nearby scare them and make them stop and run?
Edit: Yes, I know adult cats don't meow at each other, only at humans. I'm just reporting what was told to me.