### animal | vertebrate | bird | waterfowl | duck:

Mallard
* All mallards have a blue speculum that is visible when the birds are in flight.
* Most mallards are located in nests.
* Most mallards are located on habitats
  - eat food
* Most mallards feed in environments
  - ponds
  - wetland
  - fly over shores
  - has-part legs
  - lay eggs
  - live in ponds
  - make nests
  - migrate to latitudes
  - nest on the ground
  - possess feathers
  - require water
  - shed feathers
  - swim in water
  - visit nests
* Some mallards are inside ponds.
* Some mallards are located on eggs
  - islands
  - woodlands
* Some mallards eat roots
  - snails
  - vegetation
* Some mallards feed in lakes
  - marsh
  - float in ponds
* Some mallards have chests
  - dark brown chests
* Some mallards hide food
  - kill foxes
* Some mallards live in marsh
  - towns
  - require vegetation
  - return to ponds
  - sit in fields
  - swim in ponds
* also eat mollusks, small fish and fish eggs.
* also feed on the seeds that they find during foraging, as well as plant matter
  - tubers and rhizomes of chufa, flatsedge and bulrush
* always have blue speculums with white borders to both the front and rear margins.
* are a common sight in parks with lots of humans
  - agile fliers who can take off almost vertically
  - among the most vocal of waterfowl
  - an important game bird
  - close relatives to the Hawaiian duck, so the two species are able to interbreed
  - conspicuous, refuge orientated, and relatively easy to count
  - diurnal, which means that they are most active during the day
  - early nesters
  - found throughout North America, Europe, Asia, and Australia
  - hardy ducks, wintering regularly in southern Ontario and southern British Columbia
  - highly adaptable and can be found in prairie, forested, and urban environments
* are located on groups
  - migratory birds
* are one of the few ducks that habitually feed on grain
  - first ducks to arrive back on the breeding grounds in spring
  - most recognizable birds in the world
  - sexually more aggressive than the greys
  - susceptible to diseases in urban settings
  - swift fliers and excellent swimmers
* are the archetypal and most recognisable ducks
  - most widely distributed waterfowl species in the Northern Hemisphere
  - worlds most common bird
  - tough birds
  - undoubtedly the most recognized waterfowl in the world
  - vagrant to Central America and the Caribbean
* are very common throughout North America
  - vocal ducks, especially when feeding
* are, by far, the most abundant of the wintering ducks.
* arrive on their breeding ground already paired off.
* begin establishing pair bonds as early as mid autumn and continue through winter.
* breed almost on every pond and river throughout Luxembourg.
* can carry up to a quarter pound of grain in their esophagus.
* comprise the bulk of the duck population during migration.
* congregate in large flocks that sometimes number in the hundreds.
* eat a variety of aquatic plants and invertebrates as well as crops
  - natural and human-produced foods
* feed chiefy on water insects and snails during early summer.
  - on water plants but also readily dine on worms and bugs
* first breed late in their first year.
* form breeding pairs as early autumn.
* have ability
  - chances
  - excellent eyesight, so sit or lay in a camouflage blind in order to stay hidden
  - heads
  - senses
* hit water.
* includes air sacs
  - brains
  - breasts
  - cells
  - chest cavities
  - corpi
  - cytoplasm
  - ears
  - faces
  - flight feathers
  - mouths
  - nuclei
  - plasma membranes
  - rib cages
  - sections
  - sterna
  - talons
  - vacuoles
* is ancestor of the domestic duck
  - the framework for the electronic workbook
* live in a variety of habitats
  - fresh marshes, rivers, lakes, bays and some city ponds
  - throughout North America, Europe, and Asia
* mature sexually in their first year.
* molt after breeding.
* occur year-round across much of the United States.
* often fly in from Russia and elsewhere during the winter
  - spend the winter as far north as open water and food supplies allow
  - use man-made nesting structures placed over water
* prefer wetlands near water sources with an abundant supply of food and cover.
* remain all year because the water is free of ice.
* seek food.
* set of CGI programs and associated library modules.
* start to copulate during late autumn, months before any of the pair mates are fertile
  - up from oxbow sloughs
* take bread and grain in parks and gardens
  - up residences
* usually choose places next to water that has high grasses
  - nest on the ground, often in dense undergrowth beside lakes and streams
* web-based, interactive quizzing tool.