Back of the box:
"You've heard the old saying: "Birds of a feather flock together"? Well, the same is true when they gather on wires -- that is, before they get zapped and fly away!
On their own power lines, players arrange birds into sets of three, trying to match the same color, the same size, all different colors, or all different sizes.
Birds on a Wire includes two sets of rules: one for families with children 7 and up and another for more advanced play."