What is the significance of the birds on the doors on the west side of St. Hedwig?

The birds are a Polish symbol, and are part of the polish crest. St. Hedwig was originally founded by Polish immigrants, many of whom came from St. Stanlislaus on the south side. They built St. Hedwig because of the growing needs of the Catholic Polish community. Therefore, you will notice many such symbols of Polish heritage in St. Hedwig church.