A game by Ducan Speakman and me.
this is the the gameplay

Gamers are split into even sized groups. Each is given a set of sealed envelopes and sent to different locations in the vicinity (one location per group, maybe only 1 or 2 streets apart, but must be be out of sight of all the other groups starting points). At specified time players open envelopes, each envelope contains a description of an animal call.

Once the players know their sound they must roam/run around streets making their sound to locate the other players with the same sound. Once they have someone from every group with the same sound they must all run back to base shouting ‘LuLu’