三年级英语介绍小鸭

  Duck is the common name for a large number of species in the waterfowl family Anatidae，  which also includes swans and geese. The ducks are divided among several subfamilies in the family Anatidae

   they do not represent a monophyletic group (the group of all descendants of a single common ancestral species) but a form taxon， since swans and geese are not considered ducks. 

   Ducks are mostly aquatic birds， 

mostly smaller than the swans and geese， and may be found in both fresh water and sea water. 

  Ducks are sometimes confused with several types of unrelated water birds with similar forms， such as loons or divers， grebes，gallinules， and coots.

A duck is a very common water bird with short legs，a short neck，and a large flat beak.

It has a long neck，a wide  mouth，a pair of short wings，and a pair of pretty red feet.

Ducks are generally in the color of yellow，white or black.

They like to eat little fish，shrimps and earthworms.