They leave little sheep(?) all over the world?

I read about some group in California that distributes little ceramic sheep to people leaving on trips. The travelers then leave them in interesting places all over the world and take pictures which might be compiled somewhere? Has anybody heard of this? Can you tell me how to get in contact with them?

I’m sorry for the stupid question, but I’m going to East Africa soon and I want to participate and I can’t find anything on the internet.

I have never heard of this, but couldn’'t resist asking why would anyone use sheep to represent California? Could it be they are from a baaa…d neighborhood?