The Goosander (Mergus merganser), widely known as the Common Merganser in North America, is a large and elegant diving duck. As a member of the sawbill family, it is expertly adapted for life on the water, combining grace with predatory precision.

Ranging from 58-72 cm in length, the Goosander is a substantial waterfowl with a long, streamlined body. It is characterized by its long, narrow red bill with hooked tips and serrated edges. Males feature a striking white body with a dark, bottle-green head, while females and immature birds have a grey body with a distinctive chestnut-brown head and a shaggy crest.

Goosanders primarily inhabit freshwater environments. They prefer clear, fast-flowing rivers, large lakes, and reservoirs. During the breeding season, they are most common in wooded areas where mature trees provide the necessary cavities for nesting near water sources.

The Goosander is a specialized piscivore. Its diet is mainly composed of fish, which it catches by diving. Key food sources include:

• Small fish such as trout, salmon parr, and perch.
• Aquatic invertebrates and insects.
• Crustaceans and occasionally small amphibians.

Nesting typically occurs in tree hollows, though they will also use nest boxes or crevices in rocks and buildings. The female lays a clutch of 8 to 12 eggs. A remarkable sight is the 'creche' behavior, where one female may look after a large group of ducklings from several different broods.

These birds are expert divers, using their powerful webbed feet to propel themselves underwater in pursuit of prey. They are generally wary of humans and will take flight with a long pattering run across the water surface. In flight, they move with rapid, shallow wingbeats, often staying low over the water.

The Goosander is currently listed as Least Concern by the IUCN. While populations are generally stable, they can be affected by water pollution, habitat loss, and conflicts with fisheries in certain regions.

1. The Goosander's serrated bill earned it the nickname 'sawbill,' perfectly designed for gripping slippery fish.
2. They are among the few duck species that nest in trees, sometimes several meters above the ground.
3. A Goosander can stay submerged for up to 30 seconds during a hunt.
4. In winter, they may move to coastal estuaries if inland freshwater bodies freeze over.

For the best chance to see a Goosander, visit upland rivers during the spring or large inland reservoirs during the winter months. Use a spotting scope or high-quality binoculars to observe them from a distance, as they are easily spooked by movement on the banks.

With its striking sexual dimorphism and specialized hunting skills, the Goosander is a fascinating species for any bird enthusiast. Protecting clear freshwater habitats ensures that this magnificent sawbill continues to thrive across the Northern Hemisphere.