Waterfowl are defined here as "swimming" birds, as opposed to "wading birds". Includes ducks, geese, swans, coots, cormorants, and grebes.

https://commons.wikimedia.org/wiki/File:Canada_Goose_%28Branta_Canadensis%29.jpg
Author: Joe Ravi. Creative Commons  Attribution Share Alike 3.0 Unported CC-BY-SA 3.0

• Common and widespread, frequently seen on lakes and ponds, as well as on large lawn areas. Often considered a pest
• Call is a loud honk
• Flies in V formation
• Varies in size. "Giant" Canada geese are the most common type in urban and suburban areas.

https://www.flickr.com/photos/mikebaird/5142107138/
Author: Mike Baird. Creative Commons Attribution 2.0 Generic.

• Very large white bird with huge bill
• Migrates and breeds across the West in summer; very impressive in flocks.
• Some may spend the summer on golf course ponds in Colorado Springs
• Tips forward into the water almost like a dabbling duck, but in search of fish rather than aquatic vegetation

https://www.flickr.com/photos/aehack/8727913998/
Author: Allan Hack. Creative Commons  Attribution-NoDerivs 2.0 Generic

• Very common and widespread bird which frequently dives for aquatic vegetation
• Black all over except for white beak and red eyes
• Can be seen in mixed flocks of waterfowl
• Not related to ducks; feet are lobed rather than webbed

https://commons.wikimedia.org/wiki/File:Male_mallard.jpg
Author: Calibas. Creative Commons  Attribution Share Alike 3.0 Unported

• Very common and widespread duck
• Female is streaky brown with orange beak; male has brilliant green head
• Stereotypical loud quacks given by females
• Dabbling duck; diet mostly consists of vegetation

https://en.wikipedia.org/wiki/File:American_Wigeon_pair.JPG
Author: Howcheng. Creative Commons  Attribution Share Alike 3.0 Unported

• Dabbling duck that can often be found at the pond near Monument Creek
• Male has metallic green "eyebrow", whitish forehead and white rump; female is brown all over.
• Male gives a call that sounds like a squeaky toy; female gives a harsh quack.

https://commons.wikimedia.org/wiki/File:Double-crested_Cormorant_with_Fish_-_Flickr_-_Andrea_Westmoreland.jpg
Author: Andrea Westmoreland. Creative Commons  Attribution-ShareAlike 2.0 Generic

• Black all over except for orange face and bill. Snaky neck. Crest is rarely seen.
• Sits low in water; dives for fish
• Spends hours sunning itself with wings open
• Cormorants' feathers are less oily than ducks, allowing for less buoyancy but requiring more drying time