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The mallard (/ ˈ m æ l ɑːr d, ˈ m æ l ər d /) or wild duck (Anas platyrhynchos) is a dabbling duck that breeds throughout the temperate and subtropical Americas, Eurasia, and North Africa. It has been introduced to New Zealand, Australia, Peru, Brazil, Uruguay, Argentina, Chile, Colombia, the Falkland Islands, and South Africa.
Animal non-reproductive sexual behavior encompasses sexual activities that non-human animals participate in which do not lead to the reproduction of the species. Although procreation continues to be the primary explanation for sexual behavior in animals, recent observations on animal behavior have given alternative reasons for the engagement in sexual activities by animals. [1]
The selection for larger size in males rather than females in this species may have resulted due to their aggressive territorial behavior and subsequent differential mating success. [33] Another example is Lasioglossum hemichalceum , which is a species of sweat bee that shows drastic physical dimorphisms between male offspring. [ 34 ]
The courtship behavior, which in the strongly sexually dimorphic mallard is focused more on presentation of visual cues than in the monomorphic Pacific black duck (although it is generally similar in both species), was never recorded. Clutches consisted of 7–12 pale grey-green oval eggs, measuring 6.16 x 3.89 cm on average. [7]
Immobilization of the female also occurs in muscovy ducks. Grasping and/or grappling mating situations have also been documented in Calopteryx haemorrhoidalis haemorrhoidalis , [23] fallow deer , [6] wild orangutans (Smuts 1993), wild chimpanzees, [1] water voles (semi-aquatic rats) Arvicola amphibius, [22] feral fowl, [24] mallard (Anas ...
The 2024 survey produced a statewide estimate of 502,058 breeding ducks, a 4% decline from 2023 but 13% above the long-term (1973 to 2023) average. ... To further highlight the mallard decline, in ...
Domestic ducks are mostly promiscuous, where wild mallards are monogamous. Domestic ducks have lost the mallard's territorial behaviour, and are less aggressive than mallards. [7] [8] Despite these differences, domestic ducks frequently mate with wild mallard, producing fully fertile hybrid offspring. [9]
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