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There are calls for almost all species of ducks. Pintails, teal, wood ducks, gadwall, diving ducks and other ducks including the calls of both the male, or drake and the female, or hen. In many species, the call of the drake (male) is different from that of the hen (female). Mallard drakes make a lower pitch, longer quack than the hen mallard.
Adult drake mallard. The breeding male mallard is unmistakable, with a glossy bottle-green head and a white collar that demarcates the head and neck from the purple-tinged brown breast, grey-brown wings, and a pale grey belly. [28] The rear of the male is black, with white-bordered dark tail feathers.
xeno-canto, which translates to "strange sound", is a sounds-only project seeking to highlight sounds of birds, rather than images or videos. xeno-canto was launched on May 30, 2005, by Bob Planqué, a mathematical biologist at VU University Amsterdam, and Willem-Pier Vellinga, a physicist who now consults for a global materials technology company. [10]
The American black duck (Anas rubripes) is a large dabbling duck in the family Anatidae.It was described by William Brewster in 1902. It is the heaviest species in the genus Anas, weighing 720–1,640 g (1.59–3.62 lb) on average and measuring 54–59 cm (21–23 in) in length with an 88–95 cm (35–37 in) wingspan.
Megan Liu, lead study author and science and policy manager at Toxic-Free Future, tells Yahoo Life that this was a “minor point” in the study. “We feel bad that this happened,” she adds.
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Members of President-elect Donald Trump's transition team are drawing up a list of military officers to be fired, potentially to include the Joint Chiefs of Staff, two sources said, in what would ...
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