While other species have elegant, descriptive, diagnostic or geographic modifiers, all of these birds are simply known as "common." That's common eider, common merganser, common tern, common nighthawk ...
The common nighthawk is misnamed. It is neither common, nor a hawk, nor active at night. But the common nighthawk is close to all of these. It is conspicuous wherever it occurs. It hunts on the wing, ...
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