I did wonder if they were Russian, Anne, as there are a lot of animals made there. I've checked the Russian sites in GlassLinks and they appear not to be POPASNAJA Glass Factory. The other big Russian site I had has gone. There is a similar-coloured swan showing on here:
http://www.russianglass.co.uk/ but I think this shape is smaller, and the site seems to be having problems as I can't connect to the animals catalogue, but it's worth a look when it's working again.