The whistling ducks ( Dendrocygna), also called tree ducks, are not true ducks but are more closely related to geese and swans. Members of the stifftail group, typified by the blue-billed ruddy duck ( Oxyura jamaicensis), are highly aquatic diving ducks characterized by legs set far toward the rear of the body. albeola) are diving ducks that live in fresh and salt water, depending on the season. americana), the goldeneye ( Bucephala clangula and B. The diving ducks (or sea ducks) include the greatest number of marine species, such as eiders (which are variously classified as members of the tribe Mergini or placed in a separate tribe Somateriini) and scoters ( Melanitta), but they also include primarily freshwater species such as mergansers ( Mergus and Lophodytes), the ring-necked duck ( Aythya collaris), and the pochards ( Aythya and Netta), including the scaups ( A. Perching ducks such as the muscovy ( Cairina moschata), the wood duck ( Aix sponsa), and the mandarin duck ( Aix galericulata) have long claws and are the most arboreal of ducks, often roosting in trees. Pintails, teals, shovelers, and wigeons are also dabbling ducks classified in Anas, in addition to the gadwall ( A. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.
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