Lake Liepāja and the surrounding meadows are included in the "Lake Liepāja" nature reserve and it is Natura 2000 protected area of European significance due to its importance as a nesting and migration stop for waterfowl. The lake hosts 27 nesting, 10 wintering, and 50 protected bird species that feed here during migration. Lake Liepāja is listed as an Important Bird Area in Europe, with over 100 bird species observed in total. Bird diversity reaches its peak during the spring and autumn migration periods.
Lake Liepāja is the only lake in Latvia that does not freeze over completely in winter. During this time, a large number of birds gather in and around the open water patches. The main species include mute swans and whooper swans, with a smaller number of wild ducks, tufted ducks, smews, goosanders, Canada geese, and other waterfowl. Predatory birds such as white-tailed eagles, northern goshawks, and sparrowhawks can also be seen nearby, looking for an easy prey.
Observation towers are the best place to watch birds on Lake Liepāja.