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单语范例（未经PONS编辑处理）
The male has a teal-like whistle, whereas the female has a mallard-like quack.
en.wikipedia.org It hybridizes with mallards which are better-adapted to utilizing habitat altered by human activity and thus are spreading throughout this range.
en.wikipedia.org The reason for this is that the mallard group evolved quite rapidly into lineages that differ in appearance and behavior, but are still compatible genetically.
en.wikipedia.org Mallard achieved this at the 90 milepost where a commemorative sign was erected by the track in 1998.
en.wikipedia.org Mallards have been observed to spend more time in unihemispheric slow-wave sleep than the birds towards the center.
en.wikipedia.org 互联网提供的例句（未经PONS编辑处理）
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www.mensch-und-haustier.de Ducks and guinea pigs can also hold together or not, two cheeky mallards.
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Enten und Meerschweine können auch zusammen oder halt auch nicht, zwei freche Stockenten.
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www.parcodeldelta.com The route is approx 2 hours long and includes observation points form visitors can watch the flight of herons, mallard ducks, kingfishers, squacco herons and ferruginous ducks.
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Der Rundweg dauert circa zwei Stunden und führt vorbei an bequemen Beobachtungspunkten, von denen man Reiher, Stockenten, Eisvögel, Fischreiher und die tabakfarbenen Reiherente beobachten kann.
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