**updated Feb. 2023**
Several related and unrelated families of birds that spend most of their time in or on the water, including:
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grebes (order Podicipediformes, family Podicipedidae)
loons (order Gaviiformes, family Gaviidae)
rails, gallinules, and coots (order Gruiformes, family Rallidae)
limpkins (order Gruiformes, family Aramidae)