The Mexican Duck (Anas diazi) is a dabbling duck in the genus Anas which breeds in Mexico and the southern USA. Most of the population is resident, but some northern birds migrate south to Mexico in winter.
The Mexican Duck was formerly considered a good species, but hybridisation with the closely related Mallard, which has spread into its range, has introduced genes from that species into diazi, and the taxonomic status is consequently compromised.
It is a bird of most wetlands, including ponds and rivers, and usually feeds by dabbling for plant food or grazing. It nests usually on a river bank, but not always particularly near water.
Both sexes of this 51-56 cm length bird resemble a female Mallard, but with a slightly darker body. Mexican Duck is mainly brown, a blue speculum edged with white, obvious in flight or at rest. The male has a brighter yellow bill than the female.
The male has a nasal call, whereas the female has the very familiar "quack" always associated with ducks.
The binomial name commemorates the Mexican engineer and geographer Augustin Diaz.
She was created as a female counterpart and girlfriend to Donald Duck, and first appeared in the cartoon "Don Donald" in 1937.
Duck Steps Out" in 1940 that she received her name and own speaking voice (she was previously played by the same person who did Donald, Clarence Nash).
In the early Donald Duck shorts, she was a duck with a red dress, and she had a bow in her hair.
The history of Daisy in animation can be traced to the appearance of her precursor Donna Duck in the cartoon short Don Donald (first released on January 9, 1937).
According to Rosa, Daisy is the sister of Donald's brother-in-law — Daisy's brother had married Donald's twin sister, Della Thelma Duck, and together, the two became the parents of Huey, Dewey and Louie Duck.
There she first attempts to act as the voice of reason between competing cousins Donald Duck and Gladstone Gander and in fact manages to prevent Donald losing his house to Gladstone because of a wager.