I once got to watch four squirrels play King of the hill on a big oak tree for like 45 minutes.
the one at the top was the hardest to displace because the second one down had to defend its position by chasing off the squirrel below it while also trying to outmanouver the squirrel at the top to displace it.
they where all spread out on the tree like there was clear levels that they held and tried to get up to the next while still defending the squirrel from below.
it's a crude drawing but it looked like a game with rules.
