
Where to see a group in a country
Of the two otters documented in the United States, one is endangered: the sea otter, as opposed to the North American river otter. That difference explains how the 20 places divide — 16 parks and 4 dives — mixing rivers and wetlands such as Congaree, Cuyahoga Valley, the Everglades, Ginnie Springs and Crystal River with the Alaskan coast at Glacier Bay. Four are World Heritage sites.
Places come from reviewed species-place links; the species shown at each place are only those in this group.