Your swans are very pretty. From the picture, they look like they might be opalino glass -- a translucent opaline glass. They appear to be balloton blown to give the nice pattern. The size and face make me think that they might not be Murano. The standard Murano animals usually don't have cute faces like your swans have. I can tell that they are good swans, though. The faces remind me of some of the Pirelli animals I have seen, but I don't know enough about the company to recognize their pieces. Another country that makes good animals with cute faces is Thailand. (But let me stop speculating about what your swans might be!)