Brent Goose. Melngalvas zoss. Branta bernicla bernicla. Ringelgans. Prutgäs. Mustlagle. Черная казарка. 

• Shy, doubtful – these are the words how I would describe this bird at the moment. Have seen it just once, and I can tell, that It didn’t let me closer.
• Starting tip: at the moment – none, in fact I don’t have even any ideas, but I hope it will change soon.