Snow goose

From Srafopedia

The Snow Goose (Chen caerulescens) is a North American species of goose. Its name derives from the typically white plumage. This goose breeds in northern Canada and the northeastern tip of Siberia, and winters much further south in the continent in the southern USA and beyond.

(Source: Wikipedia)

In His Dark Materials, this was the form of Serafina Pekkala's dæmon, Kaisa.