Podiceps auritus, commonly known as the Horned Grebe, is found across North America and Eurasia. In North America, it breeds primarily in Canada and the northern United States. In Eurasia, its breeding range extends across Iceland, Scandinavia, and northern Russia.

The Horned Grebe typically inhabits freshwater environments during its breeding season, such as shallow lakes, ponds, and marshes with abundant emergent vegetation. These areas provide suitable nesting sites and ample food supply. During the non-breeding season, or winter, the species often migrates to coastal marine environments including bays, estuaries, and coastal waters with a preference for calm sea conditions.

The Horned Grebe is a diving bird that primarily feeds on aquatic invertebrates, small fish, and insects. Its ecological niche involves maintaining the balance within aquatic ecosystems by controlling invertebrate and small fish populations. The species demonstrates seasonal adaptations, including physiological and behavioral shifts between breeding and non-breeding habitats, highlighting its ecological flexibility.