Scaup Species (Greater or Lesser)
Scaup Species (Greater or Lesser)
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This entry refers to an unidentified scaup, which could be either a Greater Scaup (Aythya marila) or a Lesser Scaup (Aythya affinis). Differentiating these two similar diving ducks requires careful attention to subtle field marks, especially head shape and bill details.
Where to spot
Widespread across the Northern Hemisphere. Greater Scaup prefer larger, more open bodies of water and coastal bays, while Lesser Scaup are more common on smaller freshwater lakes and ponds, though their ranges overlap considerably.
How to spot
For Greater Scaup, look for a more rounded head and a larger bill with a broader black tip. For Lesser Scaup, observe a peaked head and a smaller bill with a less extensive black tip. Distinguishing them often requires good light and powerful optics.
When to spot
Primarily observed during migration and wintering periods when they gather in large flocks on open water, often mixed with other diving ducks.
Where to spot
Widespread across the Northern Hemisphere. Greater Scaup prefer larger, more open bodies of water and coastal bays, while Lesser Scaup are more common on smaller freshwater lakes and ponds, though their ranges overlap considerably.
How to spot
For Greater Scaup, look for a more rounded head and a larger bill with a broader black tip. For Lesser Scaup, observe a peaked head and a smaller bill with a less extensive black tip. Distinguishing them often requires good light and powerful optics.
When to spot
Primarily observed during migration and wintering periods when they gather in large flocks on open water, often mixed with other diving ducks.
Greater and Lesser Scaup are often difficult to tell apart in the field, leading to the term 'confusing scaup' for many birdwatchers, especially when observed at a distance or in poor light.
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