anas strepera造句

• The latter, Coues'gadwall ( " Anas strepera couesi " ), was the only distinct subspecies of the widespread gadwall.
• In a study that was conducted, there were tested two hypotheses that could explain mitochondrial paraphyly of Holarctic gadwalls ( " Anas strepera " ) with respect to Asian falcated ducks ( " A . falcata " ).
• "' Coues'gadwall "'or "'Washington Island gadwall "'( " Anas strepera couesi " ) is an extinct dabbling duck which is only known by two immature specimens from the Pacific island of Teraina, Line Islands, Kiribati.
• Due to the malleability of the mallard's genetic code, which gives it its vast interbreeding capability, mutations in the genes that decide plumage colour are very common and have resulted in a wide variety of hybrids such as Brewer's duck ( mallard ?gadwall, " Anas strepera " ).