Sky Vine

Hanging off the leader's den is a vine. The cats call it the sky vine because of how high in the air it is. The leader, (or deputy) climbs up to it to make announcements, have ceremonies, or assemble clan meetings. The signiture yowl for a leader is "Let all cats old enough to catch their own prey join around the Sky Vine for a clan meeting." And that's how you know there's a clan meeting.