Lesser Scaup

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Lesser Scaup (Aythya Affinis)

Date of admission: August 17, 2026.
Reason for admission: Orphaned.

Patient History:

Lesser Scaups have several distinctive characteristics, including their striking bright yellow eyes and, in males, a vibrant purple sheen on the head that becomes especially visible when the sunlight hits it just right. As their name suggests, Lesser Scaups are the smaller of North America’s two scaup species. One of the easiest ways to distinguish a Lesser Scaup from a Greater Scaup is by looking at the shape of the male’s head: Lesser Scaups tend to have a more peaked crown toward the back of the head. Lesser Scaups are also diving ducks, rather than dabbling ducks. While dabbling ducks are often seen tipping forward with their heads underwater as they forage near the surface, diving ducks can swim beneath the water to search for food at greater depths. Lesser Scaups primarily feed on aquatic invertebrates, mollusks, and aquatic plants. These different feeding strategies are a great example of resource partitioning: Lesser Scaups and dabbling ducks can share the same ponds and lakes while relying on different food sources and feeding areas, reducing competition between them.

Because Lesser Scaups rely on healthy wetlands and aquatic ecosystems for both food and habitat, changes in water quality can have an impact on their populations. Pollutants that accumulate in aquatic environments can affect the plants and invertebrates they depend on for food, while habitat loss and changes to wetland conditions can further reduce available resources. Although the Lesser Scaup is currently considered a species of Least Concern, protecting healthy wetlands and waterways is an important part of ensuring these adaptable ducks continue to thrive.

This Lesser Scaup came to AIWC with eight siblings! The finder told us that their mother had unfortunately been injured and then disappeared. Like many waterfowl, Lesser Scaup mothers typically remain close to their ducklings, so finding young ducklings alone can be a sign that they may have been orphaned or separated from their mother.

This little duckling’s story is a reminder that protecting wildlife often starts with protecting the ecosystems they depend on. Prevention is always an important part of conservation, and healthy ponds, lakes, and wetlands benefit far more than just the animals we see on the surface. Thank you for supporting their care!