On the way West, Lewis saw and heard swans overhead. These
could have been trumpeter swans which nest in North Dakota.
Trumpeter swans, with a seven-foot wingspan that makes them
the world's largest waterfowl, were too prominent and showy
to make it through the late-19th-century fashion craze that
demanded exotic feathers for hats. But with the help of the
Red Rocks Lake National Wildlife Refuge near Yellowstone National
Park, the population rebounded from fewer than 50 in the Lower
48 in the 1930s to near 4,000 today.
State species of concern.