BIRDS IN THE POLISH CRESTS
White Eagle(?Bielik) and the red background are the device of Poland. I can't tell you more about it, because it's very scarce (it lives in South and North-West Poland and is protected) and I haven't watched it - observing it in the Gdansk Bay Coast area is impossible. The legend about Polish origin, in which the White Eagle has its own place, is very interesting.
Seagull, because of seaside location of Sopot, is placed in its crest. More about the seagull: Water birds >Laughing Seagull (? Mewa Smieszka)