Murano drink marker animals.

I've had these wee animals for a few years and so far all I've managed to deduce about them are that they are to hang on your drink to stop drinks getting mixed up perhaps? They all have little hooks on the back. I'm guessing they are tourist pieces but cannot ID the address on the box. One day I will go to Venice and find the address just out of interest but wondering if anyone recognises it and can share any info?